AgentRoamWhen does eSIM validity start?
The short answer for most travel eSIMs: the clock starts when the eSIM first connects to a supported network in your destination — not when you buy, and not when you install. That distinction is exactly what makes the smart routine possible: buy and install at home, activate by landing.
Buy early, install early — the clock waits
Because most plans activate on first network connect, you can buy days or weeks ahead and install the QR at home over Wi-Fi. The profile sits idle on the phone until you land and it touches a destination network; only then does a "10 GB / 30 days" plan start counting its 30 days. Delivery itself happens after your payment confirms — usually within minutes.
What a plan label actually promises
"3 GB · 15 days" means: from activation, whichever runs out first ends the plan — the 3 GB of data or the 15 days. The days are consecutive calendar days from that first connection, not days of use. If you leave after a week, the remaining days do not pause.
The exceptions worth knowing
Not every plan follows the first-connect rule — a minority activate at purchase or a fixed number of days after issue, and some multi-country plans start on first connect in ANY covered country. The plan details shown before checkout state the activation rule; when in doubt, install early but toggle the eSIM line off until arrival.
The routine that never fails
Order the eSIM once your trip is booked. Install the QR the evening before you fly, over Wi-Fi, and leave the line off. On landing, turn the eSIM line on and enable data roaming for that line — it connects, validity starts, and you are online before the seatbelt sign is off.