Calculator
eSIM data usage calculator
Estimate how many GB you need from maps, messaging, social, streaming, video calls and hotspot. Round up to a plan size and compare Airalo, Saily and Yesim where we have prices.
Travel eSIM tools
Free, no-account tools to size a plan before you buy. Built for travellers, with the same sourced prices we use in the guides.
By country
How much data for N days in …
Ready-made tables for Japan, Thailand, South Korea, the UK, USA, France, Italy, Spain, Turkey and China — light, typical and heavy use for 3 to 30 days, with destination notes from our guides.
Cost compare
eSIM vs roaming comparator
Put your carrier’s daily roaming pass next to a travel eSIM for the same trip. AT&T, Verizon, T‑Mobile and EE presets cited from official pages, or enter your own rate.
Phone check
eSIM compatibility checker
Search your iPhone, Samsung Galaxy or Google Pixel to see if it supports eSIM. Covers China mainland, Hong Kong and Macao iPhones, carrier locks and the *#06# EID check, with models taken only from official pages.
Power
Plug type & voltage by country
Socket types, voltage and frequency for 32 destinations, plus an adapter check for wherever your chargers are from. Sources: WorldStandards and the IEC.
Checklist
Pre-trip eSIM checklist
Four checks before you fly: phone compatibility, install at home, roaming settings on arrival, and when the plan starts counting days.
Looking for a destination? Browse the guides hub or jump to Airalo vs Saily vs Yesim.