Keep SIM Alive

Keep SIM Alive sends an SMS on the schedule you define so your prepaid, roaming, or backup SIM card is never deactivated for inactivity.

How it works

For each SIM on the device you set a recipient, a message, and a schedule for when the message goes out. Each keep-alive is a regular SMS: your carrier may charge for it as per your plan.

Features

Dual-SIM device support

Fixed send time or a random window

Off-schedule manual send

Send history with per-message outcomes

Automatic retries if network is down or the SIM is removed

Live SIM status to clearly identify the SIM

Schedule per SIM card and not per slot, so the schedule follows the SIM

Optional sticky notification while keep-alive is on

Survives reboots and app updates

Privacy

The app has no internet permission and makes no network calls: keep-alive messages are sent directly over the cellular network and all data stays on your device. No advertising, no tracking, no analytics.

Permissions

Send SMS — the keep-alive message itself

Read phone state — to properly link the schedule to a certain SIM card

Show notifications — recommended for sticky notification

Boot completed — to re-arm the schedule after a reboot

Ignore battery optimizations — optional but recommended, for reliable wake-ups

Schedule exact alarms (Android 12+) — optional and experimental, for wake-ups despite aggressive battery optimizations; recommended on devices known to kill background apps. On Android 12-14 you grant it via a separate Alarms & reminders toggle, and on Android 15+ the battery exemption above grants it automatically