KeepSim

KeepSim Blog

Don't lose a number you can't replace.

Prepaid SIMs, eSIMs, and second numbers expire in ways nobody explains until it's too late. These guides cover how it happens, what actually keeps a number alive, and the exact rules for the major carriers.

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Keeping a number

What happens if you don't use your prepaid SIM card?

A working SIM isn't the same as a number you still own. The timeline from active to gone, what counts as “use”, and why a calendar reminder isn't enough.

Reviewed June 2026 · 6 min read

 Reference

Carrier prepaid expiration policies compared (US / UK / AU / CA)

How long before each carrier recycles your number? A verified, sourced table across 30 US, UK, Australian, and Canadian prepaid carriers — bookmark it.

Last verified June 2026 · 9 min read

 High-stakes numbers

Keep your 2FA / banking SIM from quietly expiring

The number you never use is the one your bank texts your codes to — and the one most likely to get recycled. What it locks you out of, and how to keep it.

Reviewed June 2026 · 5 min read

 Keeping a number

How to keep a prepaid SIM active without spending money

You usually don't need to top up to keep your number — just one billable action before the deadline. The cheapest move that resets the clock.

Reviewed June 2026 · 5 min read

United States carrier guides

United Kingdom carrier guides

Australia carrier guides

Canada carrier guides