Cost Comparison
San Marino Carrier Roaming vs eSIM: Full Cost Breakdown (2026)
AT&T charges $10/day for San Marino roaming. Verizon charges $10/day. A travel eSIM on TIM's 5G network costs $18.08 for 10 days — 82% less than either carrier. Below is every rate, side by side.
Roaming costs by carrier
Vodafone in San Marino
Plan
Roaming Passport
Daily rate
£6/day
7-day cost
£42
14-day cost
£84
Vodafone shows the San Marino roaming rate as £6/day, but the total depends on how many days your phone touches TIM's network — including transit days where you land at midnight. An eSIM at $0.86/GB charges a fixed amount regardless of activation timing.
EE in San Marino
Plan
Roam Abroad
Daily rate
£6/day
7-day cost
£42
14-day cost
£84
EE's £6/day pass in San Marino uses TIM's network — identical to what a travel eSIM from $0.86/GB delivers.
AT&T in San Marino
Plan
International Day Pass
Daily rate
$10/day
7-day cost
$70
14-day cost
$140
AT&T's day pass covers data and calls to the US. Texts to local San Marino numbers are billed separately at $0.25-$0.50 per SMS in some plan tiers. Verify before sending local contact messages abroad.
Verizon in San Marino
Plan
TravelPass
Daily rate
$10/day
7-day cost
$70
14-day cost
$140
In San Marino, Verizon connects to TIM towers at $10/day. An eSIM reaches the same towers from $0.86/GB.
eSIM costs by provider
Metered plans (1GB-20GB)
| Tier | Price | Per GB |
|---|---|---|
| 1GB | $1.14 | $1.14 |
| 3GB | $3.20 | $1.07 |
| 5GB | $4.78 | $0.96 |
| 10GB | $8.56 | $0.86 |
| 20GB | $18.08 | $0.90 |
Unlimited daily plans
| Days | Price | Per Day | Discount |
|---|---|---|---|
| 1 days | $2.30 | $2.30 | 4% |
| 3 days | $6.62 | $2.21 | 8% |
| 7 days | $15.46 | $2.21 | 8% |
| 14 days | $29.90 | $2.14 | 11% |
| 30 days | $59.04 | $1.97 | 18% |
Network access
eSIM plans in San Marino connect to TIM's 5G network — the same towers that carrier roaming uses. San Marino has 4 mobile networks. Your eSIM routes through the primary carrier for the best coverage.
Side-by-side comparison
7-day trip comparison
| Option | Cost | Data | Speed | Network |
|---|---|---|---|---|
| Vodafone | £42 | Fair-use | LTE | TIM |
| EE | £42 | Fair-use | LTE | TIM |
| AT&T | $70 | Plan data | LTE | TIM |
| Verizon | $70 | Plan data | LTE | TIM |
| eSIM (20GB) | $18.08 | 20GB | 5G | TIM |
| eSIM (Unlimited) | $16.80 | Unlimited | 5G | TIM |
14-day trip comparison
| Option | Cost | Data | Speed | Network |
|---|---|---|---|---|
| Vodafone | £84 | Fair-use | LTE | TIM |
| EE | £84 | Fair-use | LTE | TIM |
| AT&T | $140 | Plan data | LTE | TIM |
| Verizon | $140 | Plan data | LTE | TIM |
| eSIM (20GB) | $18.08 | 20GB | 5G | TIM |
| eSIM (Unlimited) | $33.60 | Unlimited | 5G | TIM |
Per-day rate breakdown
AT&T charges $10/day. A 20GB eSIM spread across 10 days costs $1.81/day — 5.5x cheaper on the same TIM 5G network.
Hidden charges
Auto-enrollment and day-one billing
AT&T and Verizon roaming passes activate automatically when your phone connects to TIM's network in San Marino. Calendar-day billing means arriving at 11:30 PM and leaving before midnight the next day counts as two full day charges. A single background app refresh on landing triggers the first charge.
Speed throttling and data caps
T-Mobile's free international data runs at 256 Kbps — too slow for Google Maps, Instagram, or video calls. Xfinity Mobile caps high-speed data at 200 MB per day before throttling. AT&T and Verizon do not publish their throttling thresholds, but users report speed reductions on sustained high-bandwidth use.
Voicemail and background app charges
Checking voicemail abroad is treated as an inbound international call. If the day pass has not yet activated, that single voicemail retrieval triggers the full daily charge. Background app sync, push notifications, and automatic app updates all count toward data usage and can activate the daily pass without your knowledge.
Fair-use caps on UK carriers
Vodafone and EE apply unpublished fair-use data thresholds for San Marino roaming. Once exceeded, speeds drop to 2G-equivalent rates while the daily charge continues. The exact threshold depends on your home plan tier and is not disclosed on the rate card.
Carrier rate analysis for San Marino
AT&T International Day Pass
Checking voicemail on AT&T in San Marino is treated as an inbound international call. That call triggers the $10 Day Pass for the calendar day, even if you did not plan to use data. A single voicemail check at 5 AM on your last morning adds $10 to your bill. Weekly AT&T cost: $70. Monthly: $300. A 20GB eSIM: $18.08 for 10 days on TIM. The eSIM does not charge for background triggers.
Verizon TravelPass
TravelPass uses your domestic Verizon data allowance in San Marino. A Verizon Unlimited plan has a deprioritization threshold (typically 50 GB). A tiered plan (e.g., 15 GB/month) shares that cap between home and travel use. If you used 10 GB at home before the trip, only 5 GB remains for San Marino while the $10/day charge continues. A 20GB eSIM at $18.08 provides an independent data bucket. Your Verizon data at home stays untouched.
T-Mobile International
T-Mobile includes San Marino in its free international data at 256 Kbps. At that speed: Google Maps loads one tile in 15 seconds. WhatsApp photo sends take 45 seconds per image. Video calls fail to connect. Uber/Lyft tracking freezes. T-Mobile's high-speed add-on lifts the cap to full 5G at $15/day ($150 for 10 days). A 20GB eSIM on TIM provides the same full speed at $18.08. Savings vs T-Mobile paid tier: $131.92.
Vodafone Roaming Passport
Vodafone applies a fair-use data cap to roaming in San Marino. The threshold is not prominently published. Once exceeded, speeds drop while the GBP6/day charge continues. A traveler who streams video or joins video calls may hit the cap within 2-3 days. A 20GB eSIM at $18.08 states its data ceiling upfront. Speed remains at full 5G until the plan is consumed. No hidden threshold, no surprise throttle mid-trip.
EE Roam Abroad
EE contract customers get Roam Abroad at GBP6/day for San Marino. EE PAYG (pay-as-you-go) customers face per-MB charges that vary by zone and can reach GBP6/MB in rest-of-world destinations. PAYG customers should purchase a 20GB eSIM at $18.08 before departure. Contract customers save GBP45.76 (roughly) by switching to an eSIM for 10 days on TIM.
Xfinity Mobile International Pass
Average daily phone usage in San Marino: 1.5 GB. Xfinity Mobile high-speed cap: 200 MB/day. You hit the throttle threshold in the first 2-3 hours of normal use. After throttle: maps load in 30+ seconds, ride-hailing apps freeze, photo uploads take minutes per image. The $10/day charge continues regardless. 10 days of throttled data: $100. A 20GB eSIM at $18.08 on TIM: full 5G all day, every day.
Three UK Go Roam
Three UK customers on plans started before June 2022 may still have free Go Roam. Customers on plans started after June 2022 pay £2/day in Go Roam destinations and £5/day elsewhere. San Marino roaming cost depends entirely on when your Three contract started. A travel eSIM at $18.08 on TIM costs the same regardless of when you signed up. No plan-date lookup required.
MVNO roaming comparison
Boost Mobile's international options for San Marino are limited to add-on packs that provide small data allotments (typically 100-500 MB) at $5-$10 per pack. A 500 MB Boost pack runs out in under 2 hours of normal smartphone use. A 20GB eSIM at $18.08 on TIM provides 40x more data than a Boost international pack. Boost customers should install a travel eSIM before departure.
Rate summary
AT&T (International Day Pass): AT&T International Day Pass costs 453% more than an eSIM for San Marino.
Verizon (TravelPass): Verizon TravelPass costs 453% more than an eSIM for San Marino.
T-Mobile (Magenta (high-speed add-on)): T-Mobile's paid high-speed tier costs more than AT&T and more than an eSIM.
Vodafone (Roaming Passport): Vodafone rest-of-world rate exceeds eSIM cost for any trip over 1 day to San Marino.
EE (Roam Abroad): EE Roam Abroad costs more than an eSIM for San Marino at all trip lengths.
Bill shock scenarios
Scenario: you land at the international airport in San Marino without a roaming plan. Your phone auto-connects to TIM. WhatsApp messages download (3 MB, $6.15). Email syncs with 2 attachments (8 MB, $16.40). Weather app refreshes (1 MB, $2.05). Total before you clear customs: $24.60 on AT&T pay-per-use. With a Day Pass: $10 for the entire arrival day. With a 20GB eSIM: $18.08 for the full 10 days.
How to switch to an eSIM
Switching from Vodafone or EE to an eSIM for San Marino: Step 1: Check if San Marino is in the EU roaming zone. If yes and you are on Vodafone/EE Pay Monthly, roaming may be free and an eSIM is unnecessary. Step 2: For non-EU San Marino: disable data roaming to prevent Vodafone's £6/day Roaming Passport or EE's £6/day Roam Abroad. Step 3: Install a 20GB eSIM at $18.08 on TIM. Step 4: Set the eSIM as default data. Keep your UK SIM for calls and texts. WiFi Calling on Vodafone and EE routes your UK number through the eSIM's data for free.
Is eSIM cheaper than roaming in San Marino?
Carrier roaming in San Marino costs $100 on AT&T ($10/day for 10 days). An eSIM plan on TIM costs $18.08 for 20GB. Both connect to the same 5G cell towers. The eSIM is cheaper by $81.92, a 82% reduction. Rates verified May 2026.
Should I use eSIM or roaming in San Marino?
Use an eSIM for San Marino. It costs $18.08 for 20GB on TIM's 5G network. AT&T roaming charges $100 for the same 10 days on the same towers. The eSIM saves $81.92 with no daily billing surprises. Verified May 2026.
Does T-Mobile work in San Marino?
Yes, T-Mobile connects to TIM in San Marino, but free international data runs at 256 Kbps. That is 2G-equivalent speed. Upgrading to high-speed costs $15/day. A travel eSIM at $18.08 for 20GB provides full 5G speed on the same TIM towers. Verified May 2026.
What is the best way to get data in San Marino?
Use a travel eSIM with dual-SIM to keep your home number active in San Marino. The eSIM handles data on TIM's 5G network for $18.08. Your primary SIM stays connected for calls and texts. Carrier roaming charges $100 for the same setup. Verified May 2026.
Our verdict for San Marino
When carrier roaming makes sense
Carrier roaming makes sense for 1-day layovers where the $10 charge is less than the effort of installing an eSIM. Travelers who need voice calling to local San Marino numbers may also prefer their carrier plan, since eSIM data plans do not include voice service.
When an eSIM wins
For any trip longer than 2 days, an eSIM saves money over carrier roaming in San Marino. Families and groups save even more because carrier charges multiply per person. Countries with airport SIM queues make eSIM especially valuable — install before departure, activate on landing.
Bottom line for San Marino
For a 10-day trip to San Marino, an eSIM saves $81.92 vs AT&T and delivers the same 5G connection on TIM's network.
San Marino connectivity details
Local network infrastructure
San Marino has 4 mobile networks. Primary carriers: TIM, WindTre, Iliad. Both carrier roaming and eSIM connect to these same networks.
Good to know
San Marino uses Type C/F/L power sockets. A dead phone means a dead eSIM connection — pack the right adapter to keep your device charged between venues.
Good to know
In San Marino, dial 112/113/115/118 for emergency services. Calling 112 may not connect on all networks. This number works on any active SIM or eSIM, including plans with exhausted data balances.
Frequently asked questions
- Is roaming or eSIM better for San Marino?
- For trips longer than 2 days, an eSIM is cheaper than carrier roaming in San Marino. AT&T charges $10/day while an eSIM costs $18.08 total for a 10-day trip. Both use TIM's 5G network — the only difference is the price.
- What hidden charges does AT&T have for San Marino roaming?
- AT&T's International Day Pass auto-activates when your phone connects to TIM's network in San Marino. Calendar-day billing means arriving at 11 PM costs a full $10. Background app sync, voicemail retrieval, and notifications can trigger the daily charge on days you intended to stay offline.
- Do eSIMs use the same network as carrier roaming in San Marino?
- Both eSIM and carrier roaming connect to TIM's 5G towers in San Marino. The network, coverage area, and download speeds are identical. The difference is pricing: carriers charge $10-$15/day while eSIMs charge a flat rate for the entire trip.
- Is T-Mobile roaming really free in San Marino?
- T-Mobile Magenta includes free data in San Marino, but speed is throttled to 256 Kbps. That is too slow for maps, video calls, or photo uploads. The high-speed add-on costs $15/day — more expensive than most eSIM plans.
- Can I use eSIM and keep my carrier number in San Marino?
- Dual-SIM phones (most models since 2019) run both your carrier SIM and the travel eSIM simultaneously. Your home number stays active for calls and texts over WiFi. The eSIM handles all data on TIM's 5G network in San Marino.
- What speed does carrier roaming get in San Marino?
- Carrier roaming in San Marino connects to TIM's 5G network — the same towers and speeds that an eSIM uses. AT&T and Verizon offer LTE speeds through their day pass. T-Mobile's free tier is capped at 256 Kbps unless you pay for the high-speed add-on.
- Does Verizon auto-charge for roaming in San Marino?
- Verizon TravelPass activates automatically when your phone connects abroad in San Marino. A single background data transfer triggers the $10/day charge. The only way to avoid it is to disable data roaming in your phone settings before landing.
- How do UK carrier rates compare for San Marino?
- Vodafone and EE charge £6/day for San Marino roaming outside their EU free-roaming zone. That is roughly $7.50/day at current exchange rates. An eSIM on TIM's network costs $18.08 for the entire trip.
- How much does carrier roaming cost in San Marino?
- A family of four on AT&T in San Marino pays $40/day ($10/day per line x 4). Over a week that reaches $280. The same family shares one travel eSIM on TIM starting at $1.14 for 1GB — a single purchase covers all devices through tethering. Verizon charges the same per-line rate. T-Mobile includes free data at 256 Kbps, which cannot load a map.
- Is T-Mobile's free international data fast enough in San Marino?
- No. At 256 Kbps, T-Mobile's free international tier in San Marino cannot load a map tile in under 15 seconds. Video calling needs 2 Mbps minimum — eight times what T-Mobile provides for free. Their paid speed upgrade runs $15/day. A 5G eSIM on TIM at $0.86/GB gives you real speeds without the daily fee.
- How is my roaming bill calculated in San Marino?
- At 3 days in San Marino: AT&T costs $30, eSIM costs 1GB for $1.14. At 7 days: AT&T $70, eSIM same 1GB for $1.14. At 14 days: AT&T $140, eSIM same fixed rate. The eSIM billing model is flat — the longer the trip, the wider the gap. T-Mobile free tier is $0 but too slow at 256 Kbps to be usable beyond text.
- How much data does Google Maps use in San Marino?
- Google Maps uses 5-10 MB per hour of active navigation in San Marino. On AT&T pay-per-use that costs $10-20 per hour of driving. On a roaming day pass at $10/day, maps are covered but you pay the daily fee regardless. On a travel eSIM at $0.86/GB on TIM, a full 8-hour day of navigation costs under $0.10. Download offline maps before departure to cut data usage by 90%.