> ## Documentation Index > Fetch the complete documentation index at: https://docs.fizen.io/llms.txt > Use this file to discover all available pages before exploring further. # Fizen eSIM > The cheapest eSIM data plans on the market — 150+ countries, pay with USDT or card, activate in one click. Fizen eSIM lets you buy data plans for 150+ countries directly from the Fizen App. Pay with USDT or your bank card, tap one link to activate, and land connected — no SIM swaps, no roaming charges, no surprises on your phone bill. Buy and activate in 2 minutes — right from the app *** ## Why Fizen eSIM * **Cheapest on the market** — on like-for-like data plans, Fizen beats Airalo, Saily, Holafly, and Nomad head-to-head * **150+ countries** — one app covers your connectivity worldwide * **Pay with USDT or fiat** — USDT straight from your wallet, or Visa/Mastercard via Stripe. No bank account needed * **One-click activation** — after purchase, just tap the activation link. No QR codes, no manual setup * **No roaming bills** — fixed price, no surprise charges * **1:1 Trip Guarantee** — if your eSIM doesn't work at your destination, we replace it 1-for-1 or refund you. Zero fees, no questions asked *** ## Who it's for * Travelers who are done paying \$10/MB in roaming fees * Digital nomads hopping between countries every few weeks * Business travelers who need instant data the moment they land * Anyone comparing Airalo or Saily prices — check ours first * Anyone who holds USDT and wants to spend it on something useful eSIM is available inside the **Fizen Super App** — the same app you use for Card, QR Pay, and everything else. *** ## Guides Purchase and one-click activation Check if your phone supports eSIM No internet? Fix it in 2 minutes Free 1-for-1 replacement or refund Hotspot, phone number, top-up & more