The short version
Activation is automatic. The data plan starts the first time your phone connects to a mobile network in your destination country. You don’t “start” the plan — your phone does it for you when it lands.
What to do when you land
- Turn airplane mode off.
- Wait 20–60 seconds while your phone finds local networks.
- Switch your data line to the SimKit eSIM:
- iPhone: Settings → Mobile Data → tap your SimKit eSIM → turn “Turn on this line” on. Then under “Mobile Data,” select the SimKit eSIM. Turn off “Mobile Data Switching” if you don’t want your home SIM accidentally pulling data.
- Android: Settings → SIMs → tap your SimKit eSIM → enable. Then set “Mobile data” to use the SimKit eSIM.
- That’s it. Open Maps or Safari to confirm data is flowing.
Recommended phone settings abroad
- Keep your home SIM enabled for calls and SMS. That’s how your bank’s 2FA codes still arrive. Just disable data roaming on the home SIM so it can’t accidentally rack up charges.
- iPhone users: turn off Mobile Data Switching in Settings → Mobile Data. It’s a feature that lets iPhone use whichever SIM has better signal — useful at home, but abroad it can cause your home SIM to pull data when SimKit’s signal dips for a second.
- iMessage and FaceTime: these will automatically route over data. If a friend back home is on Android, your texts to them will now use your home SIM’s SMS allowance — worth checking that’s included on your plan.
How long until my data starts working?
Usually instant. Occasionally up to 5 minutes if the local network is slow to register a new device. If it’s been longer than 10 minutes and you have signal but no data, turn airplane mode on for 10 seconds, then off. That forces a fresh network registration.
The activation clock
Your plan duration (7 days, 15 days, 30 days etc.) starts ticking from the moment your data first flows — not the day you bought it, and not when you installed the QR. So if you buy a 7-day Japan plan in January but don’t fly until February, the 7 days only start in February.