If you don't travel for a long time, what happens to your account

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There's nothing to keep alive: no plan running, no charge, and no data used between trips. Sign in whenever you next need a plan and everything is where it was. Changed phone in the meantime? See New phone, reset, or lost phone: getting set up again. Changed email address? Update it before you buy; see Change the email or phone number on your account.

Kreds are the exception. They expire 12 months from the date they're issued and can't be reinstated. If you have a balance and a trip coming up, use them; see How Kreds and referral credit apply to a purchase. A saved card that expires in the meantime is worth updating before you buy; see Manage saved payment methods.