United States
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.

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.

Every Flysimio US plan includes mobile hotspot at no extra charge and with no speed throttling, so you can tether a laptop, tablet, or a travel companion's phone and use your full data allowance however you like. Because it's a data-only eSIM, it doesn't come with a US phone number — but that's rarely a limitation for travellers: you can call and message over the internet with WhatsApp, FaceTime, Messenger, or Google Meet, and your home number stays reachable on your primary SIM. This keeps costs predictable and avoids the per-minute charges of traditional roaming.

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.