Match the validity to your full trip
Choose a validity period that covers every day you need mobile data, including your arrival and departure days. Do not assume a plan starts when you land. Some providers begin the validity period when the eSIM is installed, while others start it when the eSIM first connects to a supported network.
Check the activation rule before installing. A low priced plan can become poor value if its validity starts too early or expires before the end of your trip.