Roaming Price Audit: What 10 Days of Data Cost in Guernsey

AT&T charges $12/day on International Day Pass for Guernsey. Verizon charges $12/day on TravelPass. T-Mobile's Experience More and Experience Beyond plans include 5GB and 15GB of high-speed data abroad, then at a reduced speed, and Essentials includes texting only. Land without a plan and AT&T bills $2.05/MB, so a single gigabyte costs $2,099. Five travel eSIM providers sell Guernsey data against those rates: HelloRoam, Holafly, Nomad, Airalo, and Saily. Fixed plans start at $5.04 for 1GB on a local 4G LTE network. HelloRoam posts the lowest fixed rate in the group, $2.01/GB on the median 5 GB plan across 40 countries, against $2.30 on Nomad. HelloRoam's 7-day unlimited plan has the lowest median of the five at $21.50 across 35 countries, against $27.50 on Holafly. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.

Until the allowance ends. 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. On the same local towers in Guernsey, a travel eSIM runs full 4G LTE from $3.04/GB. The five providers differ on what happens next: HelloRoam and Holafly refund unactivated plans for 180 days, Airalo for 14. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.

A traveler lands in Guernsey, checks one notification, and AT&T bills $12 for the next 24 hours. That is per-day billing: any cellular connection, including a background sync, starts the full 24-hour charge. Without a day pass the rate is $2.05/MB, so a 20 MB burst of photo syncing costs $41. An eSIM is a fixed cost at 1GB for $5.04, with no per-day trigger and no per-MB meter. HelloRoam's unlimited plan removes the meter a different way, at a 7-day median of $21.50 against $27.50 on Holafly. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.

A week of unlimited data is the like-for-like price. The median 7-day unlimited plan across the 35 countries where all five were priced costs $21.50 on HelloRoam, $25 on Nomad, $26.99 on Saily, $27 on Airalo, $27.50 on Holafly. The plans differ in full-speed data: HelloRoam's plan runs at full speed for 2 GB a day in 33 of those 35 countries, while Airalo's holds 3 GB in most and Holafly states no daily cap. AT&T bills $84 for the same week in Guernsey at $12 a day, $62.50 more than the HelloRoam median. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.

Four models, four answers. AT&T pay-per-use: $2.05 a megabyte, so one gigabyte reaches $2,099. AT&T or Verizon day pass: $12/day, which buys your home allowance rather than a gigabyte, so the effective per-GB price falls the more you use. Fixed eSIM bucket, median 5 GB plan: $2.01/GB on HelloRoam, $2.30/GB on Nomad, $2.40/GB on Airalo, $2.60/GB on Saily, or $3.04/GB locally on Sure GG. Unlimited: $3.07/day on HelloRoam's 7-day plan and $3.93/day on Holafly's, where the per-GB figure drops the harder you push it. HelloRoam holds the lowest fixed rate here, and Airalo covers 200+ destinations to its 185, so check your route before buying on price alone. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.

Because the rule binds European operators, not American ones. "Roam like at home" caps what a European carrier may charge its own subscribers inside the bloc. AT&T, Verizon, and T-Mobile sell US plans, so nothing in Guernsey obliges them to follow it. They apply their standard international rates instead: AT&T and Verizon $12 per 24 hours, and T-Mobile 5GB or 15GB of high-speed data on its Experience plans, then up to 256Kbps. A travel eSIM skips the policy question by buying local capacity directly at $3.04/GB on a local 4G LTE network. UK travelers should read their own tariff: Vodafone and EE include EU destinations on most plans, though not on all of them. Rates checked June 2026.

No. AT&T International Day Pass costs $12/day in all European countries including Guernsey. Over 7 days that is $84. A 5GB eSIM plan costs $20.70 for the same period on Sure GG. The eSIM saves 75% and does not charge you on days when you only use WiFi — unlike the day pass, which triggers the moment any cellular data is used.

Pick on coverage count first, price second. A regional Europe plan puts the whole route under one data bucket, so crossing a border costs nothing extra. Airalo and Holafly each list 200+ destinations and Nomad lists 200. Airalo's 5 GB plan works out at $2.40/GB on the 30 Oct 2026 medians. HelloRoam covers 185 at $2.01/GB, the lowest median 5 GB rate here; Nomad runs $2.30/GB. Holafly sells unlimited only, at a 7-day median of $27.50, across 200+ destinations, level with Airalo. AT&T and Verizon charge $12/day in every Schengen country alike, so four countries over two weeks through Guernsey still bills $120. Carrier rates checked June 2026; eSIM prices from the 30 Oct 2026 price check.

GDPR governs how companies process personal data, not how your phone uses mobile data. A travel eSIM in Guernsey connects to a local network — the same infrastructure AT&T and Verizon route roaming through. GDPR does not change connection speeds, pricing, or data limits. Both carrier roaming and travel eSIMs log metadata (connection times, data volumes) as part of standard carrier operations. GDPR applies to the provider's handling of that log data, not to your browsing or usage.

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 Guernsey starts at $3.04/GB on a local 4G LTE network — better per-GB value than all three carriers.