USA
eSIM.Fast 5G data plans. Instant activation, no SIM swap.

The best US eSIM comes down to three things: network reach, honest pricing, and how fast you're online. Flysimio runs on AT&T, Verizon, and T-Mobile — the three national carriers that together cover more than 99% of the populated United States — with 5G in over 300 cities from New York to Los Angeles. Plans are prepaid with no contract and no surprise roaming charges: you pick the data you need, pay once, and the price you see is the price you pay. Delivery is instant — your QR code arrives by email seconds after checkout — and installation takes under a minute. Every plan includes mobile hotspot at no extra cost and a 7-day money-back guarantee, so you can buy with confidence before you fly. Comparing providers first? See our best eSIM for USA guide — and for cross-border trips, one North America eSIM covers the USA, Canada, and Mexico together. Heading across a border? See our Canada eSIM and Mexico eSIM plans.

Getting online in the US takes about two minutes. First, check your phone supports eSIM — any iPhone from the XS (2018) onward and most Android flagships since 2020 do. Next, choose your US plan on Flysimio and pay with card, Apple Pay, or Google Pay. Within seconds you'll receive an email with a QR code. Before your flight, open Settings → Cellular → Add eSIM on iPhone (or Network & Internet → SIMs → Add eSIM on Android) and scan the code; you can also enter the details manually if you prefer. Keep your home line as default until you land. The moment your plane touches down at JFK, LAX, O'Hare, or any US airport, your Flysimio line connects automatically to a local network — no kiosk, no physical SIM, no waiting.

Most travellers over-buy. For light use — maps, messaging, and email — around 300 MB a day is plenty, so a 3–5 GB plan covers a week comfortably. If you also scroll social media, stream music, and share photos, budget roughly 700 MB a day: a 10 GB plan suits most two-week trips. Heavy streamers, video callers, and anyone tethering a laptop should plan for 1.5 GB or more per day and consider an unlimited daily plan. Not sure? Use the data calculator above — pick your travel style and trip length and we'll suggest the right size. And if you run low, you can add more data mid-trip instead of buying a whole new eSIM.

Flysimio works as a second line alongside your normal SIM, so you keep your home number for calls and texts while your US data runs on the eSIM — standard dual-SIM behaviour on iPhone XS and later and most Android phones from 2018 on. After installing, set your Flysimio eSIM as the line for cellular data and turn on Data Roaming for that line only; this simply lets it connect to US networks, and there are no roaming fees. Your home line can stay active for iMessage and calls, or you can switch it off to avoid your own carrier's charges. If you're unsure whether your exact model is supported, check the compatibility page before you buy.

No — and it is worth being clear about that before you buy, because plenty of listings are vague on it. A Flysimio US plan is a data-only eSIM: there is no US number attached, so it cannot receive an SMS verification code and cannot take a call over the mobile network. What it does include, at no extra charge and with no speed throttling, is mobile hotspot, so you can tether a laptop, tablet, or a travel companion's phone and spend your full allowance however you like. For calls and messages, travellers use WhatsApp, FaceTime, Messenger, or Google Meet over the data connection, and because almost every recent phone is dual-SIM your home number stays reachable on your primary SIM at the same time. If you specifically need a US number — for a bank, a delivery, or a service that insists on SMS to a local line — the usual answer is a separate calling app that rents you one, or a US carrier's prepaid SIM; a travel data eSIM is the wrong tool for that job, and we would rather say so than sell you one and have you find out on arrival.

For a weekend city break or a business conference, a small 1–5 GB plan on a 7-day validity is the cheapest way to stay connected. For a two-to-four-week road trip or a longer visit, a 10–20 GB plan or an unlimited daily option gives you room to navigate, stream, and work without watching a meter. Because Flysimio plans give you six months to activate, you can buy well ahead of your trip and the countdown only starts when your eSIM first connects in the US. There's no contract and nothing to cancel — when the plan ends it simply stops, and you can top up or buy again whenever your next trip comes around.

Every US plan here is prepaid in the strict sense: you pay once for a set amount of data and a set validity window, and that is the whole transaction. No contract, no credit check, no deposit, no monthly bill, and nothing that renews on its own — when the data or the validity runs out, the plan stops. That is the practical difference from a US carrier's prepaid line, which still wants an account, an address, and usually a local number. The ladder starts at 1 GB on a 7-day validity and runs up through 3, 5, 10, 15 and 20 GB on 30-day windows, with a 20 GB option on 90 days for longer stays. Price per gigabyte improves as the plans get bigger — the 1 GB plan is the most expensive per gigabyte and the 15–20 GB plans the least — so if you are between two sizes, the larger one is usually better value than buying the smaller one twice. The plan selector above shows every size with its per-gigabyte cost so you can see that trade-off rather than guess at it. Want the mechanics of buying first? See how buying an eSIM works.

Not in the way the word suggests, from anyone — and this is the most over-promised thing in the category. Our US daily plans give you a full-speed allowance each day (0.5 GB, 1 GB or 2 GB depending on the plan) that resets every 24 hours, then slow down for the rest of the day. We label them by that daily allowance rather than as "unlimited", because the allowance is the number that determines what you can actually do. Competitors mostly work the same way and describe it differently: Airalo sells a US pass billed as "Unlimited" that is 3 GB per day at full speed and then throttled to roughly 1 Mbps, and Nomad's "Unlimited" is a daily high-speed allowance that resets every 24 hours and then drops to about 512 kbps. Holafly is the genuine exception — no daily high-speed cap, with a fair-use policy instead — and it is priced accordingly. So the honest comparison is not unlimited versus limited, it is how much full-speed data you get per day and what you pay for it. If you stream or tether heavily every day, a daily plan is the right shape; if your use is bursty, a fixed 10–20 GB plan is usually cheaper for the same real-world experience. Every figure we quote for a competitor is dated and source-linked in the eSIM price index.