Guam · roaming cost calculator
Guam Roaming Price Audit: $12 a Day Against a $74.77 Plan
HelloRoam is the top pick for Guam on this site's rubric, though its 7-day unlimited plan there costs $87.41, at full speed for the first 2 GB a day, above the $84 a week on AT&T's $12-a-day pass, so for one week the day pass costs less, and Holafly ranks second on this site's rubric. HelloRoam's support replies in your own language over live chat, WhatsApp and email. Airalo covers 200+ destinations to HelloRoam's 185. HelloRoam's price is from its catalogue of 29 Oct 2026, rivals' from the 30 Oct 2026 price check; AT&T's rate was checked June 2026.
Currency is the column nobody prices. HelloRoam settles a Guam order in 31 currencies, and a dollar charge on a euro or sterling card picks up 2 to 4 percent at the bank.
eSIM plan rates provider-by-provider, Guam
GTA covers cities, transport routes, and tourist areas in Guam. HelloRoam sells into that market: fixed data from $7.99 for 1 GB over 7 days, and unlimited at $87.41 for 7 days of unlimited data, at full speed for the first 2 GB each day. Rural gaps affect the eSIM and carrier roaming equally.
Get eSIMHolafly's unlimited tier runs over Guam's 4G LTE networks. Stream, navigate, and video-call without tracking per-GB usage — the daily rate is the total cost.
Get eSIMNomad delivers QR codes within minutes via email and in-app. In Guam, the plan connects to a local 4G LTE network as soon as the device leaves airplane mode.
Get eSIMHeavy data users in Guam should compare Airalo's 10GB plan at $2.40/GB against Holafly's unlimited tier. Airalo is cheaper under 7-8GB of daily usage.
Get eSIMSaily is owned by Nord Security, which also runs NordVPN and NordPass. In Guam, its 4G LTE eSIM at $2.60/GB comes from a vendor whose security infrastructure is independently audited.
Get eSIMCompare providers: Airalo vs Holafly · Airalo vs Saily · Airalo vs Nomad · Airalo vs HelloRoam · Holafly vs Saily · Holafly vs Nomad · Holafly vs HelloRoam · Saily vs Nomad · Saily vs HelloRoam · Nomad vs HelloRoam
The full picture
Carrier rate audit on data roaming, Guam
Every major carrier's published Guam rate, side by side, with the eSIM winner highlighted.
| Carrier | Plan type | Daily | 7-day | Speed | Data limit |
|---|---|---|---|---|---|
| AT&T | International Day Pass | $12.00source | $84.00 | LTE | Plan data |
| Verizon | TravelPass | $12.00source | $84.00 | LTE | Plan data |
| T-Mobile | International Pass | $10.00*source | $50.00 | LTE | 2GB per 1 Day pass |
| eSIM · HelloRoam | 20GB data plan | — | $74.77 | 4G LTE | 20GB |
*T-Mobile's Experience More plan includes 5GB of high-speed data abroad and Experience Beyond 15GB, then data runs at up to 256Kbps. Essentials includes texting but no data. The 1 Day International Pass costs $10; the 7-day figure is the cheapest pass mix, 10-day pass.
Compare all carrier roaming plans to see how AT&T, Verizon, T-Mobile, Vodafone, and EE stack up against eSIM providers.
Pay-per-use cost audit
AT&T pay-per-use costs in Guam: a scenario breakdown
The worst-case AT&T pay-per-use scenario in Guam: you land, turn off airplane mode, and forget to activate an international plan. Your phone syncs email, checks for app updates, and loads the map you opened. AT&T charges $2.05/MB in that state. A 30-minute Zoom call costs $922. 1 hour of Google Maps adds $102. Uploading 20 photos to iCloud runs $410. One hour of YouTube while hotel WiFi lags: $1025. A full gigabyte at AT&T's pay-per-use rate: $2,099. Source: AT&T international rate card, June 2026.
Personalize your savings
Your Guam saving against $12 a day
Adjust the trip length, the carrier and the daily data below and the calculator reprices both sides. The starting point is the 10-day average stay recorded for Guam: $120 on an AT&T day pass at $12 a day, against $74.77 for a 20GB travel eSIM. Both prices buy access to the same local operators.
Network coverage
Guam mobile infrastructure: what travelers connect to
GTA Wireless operates the sole mobile network in Guam. US carriers pay GTA Wireless for roaming access and pass that cost to you at $12/day. Travel eSIMs use the same GTA Wireless agreement at $3.74/GB. Same coverage map. Different bill. Guam runs 4G LTE on a local network. That is enough for maps, streaming, and video calls. Carrier roaming and eSIMs deliver that same speed. AT&T charges $12/day for it. An eSIM charges $3.74/GB.
Network attachment record
The networks behind both prices in Guam
HelloRoam publishes one local operator for Guam: GTA Wireless.
One operator means no fallback network.
Where GTA Wireless has no signal, an eSIM has nowhere else to attach.
HelloRoam records no 5G operator for Guam.
Carrier roaming meets the same ceiling, because roaming rents local networks.
Price is what separates the two options in Guam. This page prices both.
5G and 4G here are capability labels. Neither one is a speed reading.
HelloRoam's operator record names GTA Wireless for Guam. The same file holds 185 destinations, 154 distinct operators and 98 destinations with at least one 5G entry. Nothing in it says which operator a handset picks, and neither does this page.
| Operator | Network generation on file |
|---|---|
| GTA Wireless | 4G |
Source: HelloRoam package feed, read 17 August 2026. The feed publishes an operator list for every destination it sells. No speed test sits behind this table, and we ran none. The full operator map covers 185 destinations.
Pricing breakdown
Guam roaming rate breakdown
Verizon TravelPass for Guam: $12/day x 14 days = $168. AT&T International Day Pass: 10 daily fees × $12 (AT&T's cap per bill cycle) = $120. A 10GB eSIM on a local network covers the full 14 days for $37.40. That is $82.60 less than AT&T and $130.60 less than Verizon.
Per-day data costs in Guam: AT&T $12, Verizon $12, T-Mobile $10, eSIM $2.67. The eSIM figure is derived from a $37.40 10GB plan spread across 14 days. Carrier rates are fixed regardless of how much data you use each day.
eSIM plan tiers for Guam: 1GB at $7.99 ($7.99/GB), 3GB at $12.71 ($4.24/GB), 5GB at $19.95 ($3.99/GB), 10GB at $39.87 ($3.99/GB), 20GB at $74.77 ($3.74/GB). Unlimited daily data costs $11.35/day on the 14-day plan ($158.93 in all). That unlimited tier costs more than AT&T's $120 roaming bill, so a fixed tier is the one to compare.
Guam publishes five unlimited durations: 1 day at $14.19, 3 days at $40.44, 7 days at $87.41, 14 days at $158.93, 30 days at $289.48. Buying the 30-day block brings the daily price to $9.65. Unlimited here means 2GB a day at full speed before a fair-use policy applies. Catalogue prices read 29 Oct 2026.
Trip cost breakdown
Guam roaming bill by trip type
Three days in Guam costs $36 on AT&T at $12/day. A 2GB eSIM on a local network covers the same period for $12.71. Difference: $23.29.
Fourteen days costs $120 on AT&T, because it bills at most 10 daily fees per line each bill cycle. A 20GB eSIM on a local network covers 15GB of photos and video calls for $74.77. Difference: $45.23 (38%).
Thirty days on AT&T costs $120. A 50GB eSIM on a local network covers 50GB for $186.97. Difference: $-66.97 over the month. AT&T rate: $12/day regardless of data consumed, at most 10 daily fees per line each bill cycle. Rates checked June 2026.
Airport options
Airport data options when you land in Guam
Airport SIM counters in Guam sell prepaid data cards to arriving travelers. The transaction requires your passport and takes 15-30 minutes including queue time. A travel eSIM on a local network costs $7.99 for 1GB and installs before departure. You land with data already active.
Data planning
How to plan your data for 7 days in Guam
Uploading photos to Google Photos or iCloud uses roughly 10 MB per photo in full resolution. Fifty photos per day adds 500 MB before you factor in maps or calls. At 1.5 GB average daily usage in Guam, a 7-day trip needs 11GB minimum.
The 20GB plan at $74.77 ($3.74/GB) is the best fit for this usage. Compare that to AT&T's $84 for the same 7 days on the same local towers. For heavy data users, a 1-day unlimited plan costs $14.19, not under AT&T's $12/day pass.
Connectivity
WiFi availability in Guam
Hotel and cafe WiFi reduces your cellular data needs in Guam, but does not eliminate them. Navigation, real-time transit, and ride-hailing apps all need data outside WiFi zones. AT&T covers those moments at $12/day. An eSIM on a local network covers the same gaps at $3.74/GB — you pay for only what you use.
Plan your data
How many GB you need for Guam
AT&T and Verizon customers arriving in Guam often leave carrier roaming on by default and pay $12/day without realizing it. Over 10 days that becomes $120. A 20GB eSIM on a local network costs $74.77 — 38% less for the same connection.
Guam has one mobile operator: GTA Wireless. US carriers pay GTA Wireless for roaming access and pass that cost to you at $12/day. An eSIM connects to GTA Wireless directly at $3.74/GB — no carrier markup.
Local prices in Guam are in USD ($), but eSIM plans are priced in USD, eliminating exchange rate uncertainty on your data costs.
Quick reference
Guam Travel Essentials
911
911 reaches police, fire, and ambulance in Guam. Save the number before you arrive — do not rely on memory in an emergency. 911 works from any phone, including a travel eSIM with no local number.
Type A/B
US plugs (Type A flat two-prong and Type B three-prong) fit Guam's outlets directly. No adapter is needed for phones, laptops, or standard US electronics. Voltage is 120V — compatible with dual-voltage US chargers.
ChST (UTC+10)
USD ($)
Cash in USD is preferred across most of Guam outside major hotels and tourist centers. Card terminals are not common in local markets or small restaurants. Withdraw enough cash at a reliable ATM before leaving the city — rural areas may not have ATM access.
Quick tip
Prices in Guam are in USD ($). Buying an eSIM in USD before departure removes the variable of exchange rates affecting your data cost mid-trip.
Good to know
Guam's emergency number is 911, not 112. Both carrier roaming SIMs and eSIMs can dial emergency numbers without an active data plan.
Step by step
How to cut roaming charges on a Guam trip
- Open Settings > Cellular on your iPhone (or Connections > SIM on Samsung) to confirm eSIM support — GTA runs LTE across Guam
- On iPhone or Pixel: open the HelloRoam app, search Guam, and purchase the 1GB plan at $7.99 — your QR code appears in the app the moment payment clears. Compare all providers before deciding.
- On Samsung Galaxy: go to Settings > Connections > SIM manager > Add eSIM and scan the QR code before you leave home so it is ready to activate on arrival
- On Google Pixel: go to Settings > Network > SIMs, select your home carrier, and disable the Roaming toggle. See the complete data roaming guide for all device types.
- First landing in Guam: if your eSIM does not connect on its own, toggle Airplane Mode on then off — this forces your phone to scan for GTA's LTE signal
- Returning traveler: if you communicate via iMessage or WhatsApp, WiFi Calling is optional — those apps run over the HelloRoam eSIM data at no added cost and cover most communication needs in Guam
Data tips
Guam app and data usage guide
QR code scanning for menus, payments, and venue check-ins in Guam uses less than 1 MB per scan. Most payment apps — Apple Pay, Google Pay, and local equivalents — work over cellular with under 2 MB per transaction. These apps add up to less than 50 MB/day total, so they are not a meaningful factor in your plan size.
Regional context
What to know about data in Guam
A few things to know before turning off carrier roaming in Guam:
US territory — US plans may include Guam
Nearby
Related destinations
6 destinations near Guam are priced on the same rate card. AT&T bills $12 a day in every one of them, and the figure beside each flag is that destination's own per-gigabyte floor. The cheapest of the group is Australia at $0.71 a gigabyte.
Forgot your eSIM?
What to do if you arrive in Guam without data
Forgot to buy an eSIM before flying to Guam? Three options, ranked by total cost.
Option 1 — Airport WiFi install ($7.99 total): The arrivals area has free WiFi. All 5 providers (HelloRoam, Holafly, Nomad, Airalo, and Saily) support post-arrival purchase over WiFi. Buy a 1GB plan for $7.99. No extra charge beyond the plan.
Option 2 — Hotel lobby WiFi install ($7.99 total): If airport WiFi failed, hotel lobby WiFi works just as well. Check in, get the password, complete the eSIM install. Same $7.99 cost.
Option 3 — Emergency carrier download ($10 + $7.99 total): Use ~5 MB of AT&T pay-per-use data to download the provider app ($10). Install the eSIM over the app, then disable carrier data. Total cost: $17.99.
Savings math
How much you save in Guam
Solo traveler
The $45.23 a solo traveler saves by choosing an eSIM over AT&T roaming in Guam covers 3 restaurant meals, 1 museum tickets, or 0 taxi rides in most destinations. That money came from the same local network connection AT&T charges $120 for.
Family trip
Families with children face double roaming costs — two parents on full plans plus two kids whose phones sync games and app updates in the background. In Guam, AT&T bills $12 a day for the first line and $6 for each extra line used the same day, at most 10 daily fees per line each bill cycle. Four lines for 10 days: $300. A single 20GB eSIM at $74.77 shared via hotspot covers all four devices. Total family cost drops from $300 to $74.77.
AT&T roaming rate analysis
AT&T International Day Pass does not add extra data for Guam roaming. It uses your existing domestic plan data allowance. A customer with a 5 GB domestic plan who has used 3 GB at home has only 2 GB left for their Guam trip. After 2 GB, AT&T throttles to slower speeds while the $12/day charge continues. A 20GB eSIM at $74.77 provides a separate data bucket that does not affect or draw from your home plan. This is the key structural advantage over Day Pass: independent data.
All-carrier summary
AT&T: AT&T International Day Pass costs 60% more than an eSIM for Guam.
Verizon: Verizon TravelPass costs 60% more than an eSIM for Guam.
T-Mobile: T-Mobile's International Passes cost less than this eSIM plan for Guam.
An eSIM saves money in Guam for every trip longer than one day. The single exception: a same-day layover where you need your US number active for voice calls. AT&T's $12 for that one day may be worth the convenience. For any trip of 2+ days, the 20GB eSIM at $74.77 saves $45.23 over 10 days on a local 4G LTE network.
Quick answers
Common questions about Guam data costs
Is eSIM cheaper than roaming in Guam?
A travel eSIM saves $45.23 on a 10-day Guam trip compared to AT&T roaming. The eSIM connects to a local 4G LTE network for $74.77. AT&T charges $12 per 24 hours of use for the same towers. The savings are 38% with no difference in coverage or signal quality. Rates checked June 2026.
How much does roaming cost in Guam?
Guam roaming costs per device: AT&T $120, Verizon $120 (10 days). A family of four pays $480 on AT&T. Four eSIMs on a local network: $299.08. Rates checked June 2026.
Does T-Mobile work in Guam?
Yes, within the plan's allowance. T-Mobile's Experience More plan includes 5GB of high-speed data abroad and Experience Beyond 15GB, then data runs at up to 256Kbps. Essentials includes texting but no data. At 256Kbps Google Maps and ride-hailing apps stall. T-Mobile's 1 Day International Pass costs $10 for 2GB, and a week of passes $50 (10-day pass). A travel eSIM on a local 4G LTE network costs $74.77 for 20GB over 10 days. Rates checked June 2026.
AT&T fine print for Guam
$12 covers 24 hours from the first time your phone uses a foreign network, and a single background push notification at 2 AM can start it. AT&T bills at most 10 daily fees per line each bill cycle (terms read 31 Oct 2026).
iCloud Photos, email push, app updates all trigger the daily charge. A phone left in a bag with data roaming on starts a new $12 fee each time a sync lands after the last 24 hours ran out.
Guam FAQ
Guam eSIM & roaming questions
Guam carrier roaming costs $12 a day on AT&T and on Verizon
Three US carriers cover Guam: AT&T at $12/day, Verizon at $12/day, and T-Mobile at $10 for a 1 Day pass, with 5GB or 15GB of high-speed data included on its Experience plans. All three rent capacity from GTA. So do the five travel eSIM providers priced here: HelloRoam, Holafly, Nomad, Airalo, and Saily, from $7.99 for 1GB. One thing the day pass does that a data-only eSIM does not: it keeps your own number live for calls and texts without WiFi. If you need that and use almost no data, $12/day is a fair trade. If you use data at all, it is not. Rates checked June 2026.
T-Mobile's included data in Guam runs at high speed until the allowance ends
Not past the allowance. T-Mobile's Experience More plan includes 5GB of high-speed data abroad and Experience Beyond 15GB, then data runs at up to 256Kbps. Essentials includes texting but no data. A photo message runs 2 MB to 4 MB, about two minutes at 256Kbps, so it drags from Guam. A travel eSIM delivers full 4G LTE on a local network from $3.74/GB, and HelloRoam at $2.01/GB holds the lowest median 5 GB rate in the market, Nomad next at $2.30. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.
Guam roaming bills by the day, not by the gigabyte
AT&T's per-day fee in Guam covers 24 hours from first use. A background email sync an hour after that window closes starts a second fee, so 25 hours on the network costs $24. AT&T stops at 10 fees per line each bill cycle. Verizon runs the same 24-hour sessions with no stated cap. A travel eSIM at 1GB for $7.99 uses data-volume billing — the cost increases only when you actually consume data.
An hour of streaming in Guam uses more data than a day of maps
An hour of Netflix in HD uses about 3 GB by Netflix's own figures, so it costs about $11.22 at $3.74/GB on GTA. Standard definition uses about 700 MB, or $2.62. YouTube at 720p uses about 900 MB an hour. Streaming is the one habit that breaks a fixed-data plan. HelloRoam's 7-day unlimited plan has the lowest median of the five at $21.50 across 35 countries, against $27.50 on Holafly, but HelloRoam's plan runs at full speed for 2 GB a day in 33 of those 35 countries, under one HD hour. Holafly states no daily cap, which is where it earns its price for a heavy streamer. AT&T covers streaming under the $12/day pass but charges it whether you watch or not. Download over hotel WiFi and the question disappears. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.
Mid-trip spend in Guam is readable in the provider app
On a travel eSIM you already know it, because you paid once and the number cannot move. You bought $3.74/GB upfront on GTA, or a 7-day median of $21.50 on HelloRoam's unlimited plan. What you track is data left, not money spent, and every provider app shows that balance. Carrier roaming inverts it. AT&T's $12/day accrues against a bill you will not see for weeks, and MyAT&T does not break out day-pass charges by country while you are still on the trip. That is the honest difference between the two billing models: one is a purchase, the other is a meter you cannot read. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.
Two weeks of Guam roaming costs $120 on AT&T
AT&T: $120 ($12/day x 14 days). Verizon: $168. T-Mobile at $10/day: $75. A travel eSIM on GTA for 2 weeks at 1.5 GB/day average costs roughly $78.54. That is an 80-90% saving over any paid carrier roaming option for the same connectivity.
T-Mobile reaches Guam on a free tier and on a paid pass
T-Mobile's Experience More plan includes 5GB of high-speed data abroad and Experience Beyond 15GB, then data runs at up to 256Kbps. Essentials includes texting but no data. At 256Kbps GPS navigation, photo uploads and video calls stall. The 1 Day International Pass costs $10 for 2GB, and a week of passes $50 (10-day pass). A travel eSIM on GTA provides full 4G LTE for $3.74/GB.
Verizon TravelPass costs $12 a day in Guam
No. Verizon TravelPass bills $12/day in Guam — $168 for a 14-day trip. A travel eSIM on GTA for the same 14 days at 1.5 GB/day costs roughly $78.54. Both connect to local 4G LTE towers — the speed and coverage are identical. The only difference is $89.46 in cost.
A US plan in Guam without an add-on bills by the megabyte
No. Using your phone in Guam without a roaming plan triggers AT&T's pay-per-use rate of $2.05/MB — $2,099 per GB. Verizon's pay-per-use rates are comparable. T-Mobile's Experience plans include 5GB or 15GB of high-speed data, then up to 256Kbps, which is too slow for maps, booking apps, or navigation. You need either a roaming plan (AT&T at $12/day, Verizon at $12/day) or a travel eSIM at $3.74/GB. The eSIM is the lower-cost option at every trip length.
A week of Guam carrier roaming costs $84
AT&T: $84/week (International Day Pass at $12/day). Verizon: $84/week (TravelPass). T-Mobile: 5GB or 15GB of high-speed data included on its Experience plans, then up to 256Kbps, or $50 for a week of passes (10-day pass). The cheapest eSIM for Guam starts at $3.74/GB on a local 4G LTE network — better per-GB value than all three carriers.
Fact check
Guam travel data: correcting the record
WiFi is always available abroad, so you do not need a data plan
Hotel WiFi in Guam covers your room. It does not cover the taxi line, the train platform, or the restaurant street. Navigation, ride-hailing, and payment QR codes all need a live cellular connection outside the hotel. A 1GB eSIM on a local network covers those gaps for $7.99. AT&T charges $12/day for the same access.
International calling cards cover data
Traditional international calling cards provide prepaid voice minutes for international calls — they do not include mobile data. Using a calling card in Guam leaves you without data for maps, messaging apps, or anything internet-based. A 1GB eSIM on a local network at $7.99 provides data-only coverage. Pair it with a calling card if you also need voice minutes to landlines. Rates checked June 2026.
Airport SIMs are the cheapest option
Airport SIM counters in Guam apply a tourist markup over in-city prepaid prices. Expect to queue 15–30 minutes and hand over your passport for registration. A 1GB eSIM on a local network costs $7.99 and installs from your phone before you board. Rates checked June 2026.
Our recommendation
Guam data costs: what our research found
On this site's rubric, HelloRoam is the pick for Guam. HelloRoam covers Guam on a local network and scores 9.9/10 on our rubric, the highest of the 5 providers we price. A 1GB plan costs $7.99. Unactivated plans are refundable for 180 days, and its support replies in your own language. Holafly is the alternative for heavy data users: it states no daily cap, at a 7-day unlimited median of $27.50 on 30 Oct 2026.
Learn more
Travel guides, Guam
4 guides carry the parts of a Guam trip this page does not price: installing the profile before departure, switching data roaming off on the home SIM, and what happens to the allowance once a fair-use policy applies. Each one reads the same rate card as this page, where AT&T bills $12 a day.
Compare Guam eSIM plans vs carrier roaming rates
eSIM plans for Guam start at $74.77. AT&T roaming starts from $12/day.
Get a Guam eSIM