Best eSIM for USA: Costs, Unlimited Data and Roaming Compared

Three carriers, three words for the same thing. Telekom says "Ländergruppe", Vodafone says "Zone", o2 says "Weltzone". Each one means: outside the EU, your bundled data does not apply here. That's the real baseline for the best eSIM for USA travel: what your own carrier would charge before you even look at an alternative.

Here's the USA eSIM comparison across all three carriers, before we get to the actual maths:

Vodafone: €9.99 for 500 MB

Vodafone's own ReisePaket Data price list puts the USA in Zone 1 and charges €9.99 for 500 MB on a single calendar day, or €29.99 for 3 GB across seven days, as of August 2026.

Red tariff customers get a second option, the EasyTravel Tag: €7.99 per day, and your normal bundled allowance travels with you. That reads well until you're there for a fortnight.

One thing is missing from that document. There's no per-MB rate for using data with no package booked at all. The list only prices the packages. I've seen figures for that floating around, but I couldn't confirm any of them on a Vodafone page, so they're not here.

o2: €0.99 per MB if you book nothing

This is the number that should scare you. o2's own price list charges €0.99 per MB for data in the USA with no option booked, billed in 10 KB increments. One photo into a group chat costs more than the coffee you're photographing.

There's a safety net, at least. An automatic cost cap limits roaming data charges to a maximum of €59.50 per billing period, and a customer can raise that ceiling to €119.00 if they really want to. Honestly, I find that mechanism more reassuring than any marketing claim in this industry. It doesn't stop the mistake. It just stops the mistake from compounding.

If you plan ahead, o2 sells Roaming Plus World at €14.99 per month for 4 GB across 100-plus countries outside the EU, the USA included. Calls and texts bill separately at the standard zone rate.

Telekom: without a pass, nothing happens

This is the counterintuitive one, and probably the single most useful fact in this article. Telekom's own international roaming price list for prepaid (as of 01.07.2026) states in plain language that without a booked data pass, data use in Ländergruppen 2 and 3 is not possible, "so that no data charges can arise". The USA sits in Ländergruppe 2, which connect.de's tier overview also confirms.

So a Telekom prepaid customer doesn't land in New York with a horror bill. They land with no internet. I can't tell you whether the same rule applies to postpaid MagentaMobil contracts, which cover most German customers. The relevant price list wasn't reachable.

On the pass prices themselves: the independent tariff tracker teltarif.de lists 15 GB for 14 days at €15.95 and 50 GB for 28 days at €29.95 for the USA, on a page dated July 2026. That's a secondary source, not a Telekom figure, and I'd treat it as such. If it's accurate, the Telekom pass is genuinely competitive. You won't read that in many eSIM comparisons, for reasons that aren't hard to work out.

Here's the scenario. Land in Los Angeles, 14 days, rental car, maps running most of the day, streaming over hotel wifi in the evening. That's roughly 10 GB for most people.

The €111.86 and €119.96 are my own multiplication of Vodafone's published daily and per-pack prices, not quotes from Vodafone. The 60 MB figure is €59.50 divided by €0.99 per MB.

The spread is ridiculous. Factor seven between the top and bottom rows of that table, same need, same country, same fortnight.

Two things soften it. If the teltarif numbers hold, Telekom's pass lands more or less level with the eSIM. And Vodafone's day pass is fine for very short trips: three days in a city is €23.97, your German number stays live, and there's nothing to set up. Somewhere around the one-week mark, that calculation flips hard.

eSIM FOX publishes a full price ladder for its USA product, and lists AT&T, T-Mobile and Verizon as the underlying networks. That's all three major US carriers.

All prices from the provider's own USA product page, as of August 2026.

Look at the jump between 20 GB and 30 GB. Cost per GB falls steadily up to 20 GB, then climbs again. So the 20 GB tier at €19.99 is the sweet spot on paper, and anyone who genuinely burns more than 20 GB in a fortnight should probably be comparing that against the unlimited tiers rather than paying €39.99 for 40 GB.

eSIM FOX Reise-eSIM USA

Saily, Airalo, Holafly, Nomad and Ubigi show up in every USA comparison, and fairly so. From what I can tell, though, the differences between them are smaller than the comparison sites imply, because they all end up riding the same three US networks.

The split that used to define this market has gotten smaller. It used to be: Holafly, Saily and Nomad market unlimited plans, Airalo sells only capped packages. That's no longer true. Airalo now lists unlimited USA tiers on its own USA product page too, running from €10.50 for three days up to €61.00 for 30 days, as of August 2026. Unlimited isn't a point of difference for the best eSIM for USA any more. It's closer to the baseline.

I'm deliberately not putting their prices side by side here. All six change monthly, and an undated price comparison isn't help, it's a trap.

Time for the word doing the heaviest lifting in this market.

Unlimited means there's no hard cap that switches your access off. It does not mean there's no throttling.

Holafly's own terms and conditions don't name a data threshold or a throttled speed for unlimited plans. The text says only that there's no fixed allowance that automatically stops data use, and that coverage and speed may be subject to a network provider's fair use policy. Where that line sits, the document doesn't say. Which is, I think, the most honest thing anyone can write about unlimited travel eSIMs: the ceiling exists, and the provider won't tell you how high it hangs.

Comparison sites commonly report throttle points somewhere around 1 GB to 3 GB per day on USA plans, with speeds dropping to 256 Kbps or 1 Mbps afterwards. None of that is confirmed by any provider. Treat it as a rough order of magnitude.

There's a second thing almost every comparison skips. Hotspot and tethering are often capped separately on unlimited plans, reportedly at 500 MB to 1 GB per day. If your plan is to get a laptop online through your phone, that's the number that governs your trip, not the big unlimited figure on the product page.

Practically? Under 20 GB across two weeks, a capped package makes more sense, because you know exactly what you bought. Unlimited earns its place for heavy streamers and daily tetherers who accept an undisclosed limit as part of the deal.

This comparison helps more than any provider table. In our eSIM comparison for Thailand, the same maths produces a completely different answer: data there is cheap, nearly every travel eSIM rides the same local network, and the competition happens over cents per GB. The fallback, a local prepaid SIM at the airport, is cheap too.

The USA inverts all of that. It isn't the eSIM that's expensive, it's everything else. Which is exactly why almost every provider in this market advertises unlimited plans, while barely anyone bothers in Thailand. When the alternative costs €111.86, a €39.99 flat rate sells itself.

Short section, because this matters less than tech forums suggest.

In network testing for the first half of 2026, T-Mobile led on median download speeds while Verizon led on coverage footprint. AT&T trailed on speed but improved year over year. Those figures come from Ookla measurements as reported by the tech press, not from the testing firm directly.

For a normal trip built around cities, interstates and the visitor centres of the big national parks, all three networks work. It gets interesting off that path. Rural stretches away from the main routes can have real dead zones on any of the three networks, and remote trailheads and overlooks generally have nothing at all. No provider fixes that, and no eSIM does either.

The useful question, then, isn't which network is fastest. It's which networks your eSIM can actually use. A provider that lists all three gives you more room than one committed to a single carrier. Downloading offline maps before you drive out is worth the five minutes regardless.

Nearly all travel eSIMs for the USA are data-only. No US phone number, no traditional voice line, no SMS. An eSIM for USA with calls, meaning an actual American number, is still the exception among the big travel-eSIM providers.

For most travellers that's a non-issue, since calls run through WhatsApp, FaceTime or Signal anyway. It bites in a few specific places: phoning a restaurant to book, a rental car desk calling you back, and SMS verification codes from US services that refuse foreign numbers.

Your German number stays reachable in parallel if you keep the physical SIM or a second eSIM profile active. One warning though: answering a call then bills roaming at your carrier's rate. Vodafone charges €0.29 per minute inside its ReisePaket, and other zone tariffs can run higher. Switching data roaming off for the home SIM while leaving voice active is the usual compromise.

If you genuinely need a US number, that means a local prepaid SIM once you arrive, or a VoIP service. A travel eSIM won't cover it.

Two conditions, and the second one trips people up far more than the first.

Hardware first. Every iPhone from the iPhone XS and XR onward supports eSIM, so anything since 2018. US-market iPhones from the 14 onward have no SIM tray at all. Android support varies by manufacturer and market, and the manufacturer's own compatibility page is the only reliable answer there.

Then the carrier lock, which is where this usually falls apart. A locked handset rejects an eSIM profile from any provider other than the one that locked it. On an iPhone you can check under Settings, General, About, SIM Lock. Phones financed through a German mobile contract are locked more often than their owners expect.

One more thing, because it goes wrong constantly: install the eSIM at home, on wifi, before you fly. Activation needs an internet connection, and you'll have one at the gate in Frankfurt but not necessarily after landing at Newark.

Quick checklist before you book:

• Hardware: iPhone XS/XR or later, or an eSIM-capable Android model per the manufacturer's own compatibility page

• Carrier lock: check under Settings, General, About, SIM Lock

• Activation: set up the eSIM at home on wifi, not at the gate or after landing

Worth noting on adoption: according to GSMA data, 51% of eSIM users worldwide used the technology for the first time while travelling. For most people, travel isn't the edge case. It's the entry point.

• Two weeks in the USA, ordinary usage: the best eSIM for USA travel here is a capped 10 GB or 20 GB package, installed at home, German number left active with data roaming switched off. That's somewhere in the €16 to €20 range against €60 to €120 through a home carrier.

• Three days in New York: honestly, don't bother. Vodafone's day pass at €23.97 for three days is convenient, and you skip the setup entirely.

• A road trip with tethering: the unlimited tiers are worth a look, but read the hotspot clause first. That's where the actual limit lives, not in the data allowance.

• Telekom prepaid customers: book the pass before you fly. Otherwise you're standing at the airport with a phone that simply cannot get online.