# Boost SIM reprogrammed. The curious may want to watch for behavior changes

**URL:** https://forums.rwusers.com/t/boost-sim-reprogrammed-the-curious-may-want-to-watch-for-behavior-changes/1193
**Category:** General
**Created:** [March 20, 2026, 4:49am UTC](https://forums.rwusers.com/t/boost-sim-reprogrammed-the-curious-may-want-to-watch-for-behavior-changes/1193 "2026-03-20T04:49:53Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![mwgardiner](https://forums.rwusers.com/letter_avatar_proxy/v4/letter/m/e95f7d/32.png) [@mwgardiner](https://forums.rwusers.com/u/mwgardiner)
#### Post date: [March 20, 2026, 4:49am UTC](https://forums.rwusers.com/t/boost-sim-reprogrammed-the-curious-may-want-to-watch-for-behavior-changes/1193/1 "2026-03-20T04:49:54Z")

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When I woke up this morning, I found that my Boost SIM had rebooted. This last happened a bit under two years ago. I have no idea what changed. People who have coverage issues may want to look out for changes.

For those who wonder how I know the SIM was rebooted, I PIN-lock my SIMs, a SIM reboot causes a SIM lock screen to come up, and the line is inoperable until I unlock the SIM.

Not overly interesting, but when this happens I tend to wonder what they are up to.

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### Author: ![rolandh](https://forums.rwusers.com/user_avatar/forums.rwusers.com/rolandh/32/273_2.png) [@rolandh](https://forums.rwusers.com/u/rolandh)
#### Post date: [March 20, 2026, 10:22am UTC](https://forums.rwusers.com/t/boost-sim-reprogrammed-the-curious-may-want-to-watch-for-behavior-changes/1193/2 "2026-03-20T10:22:12Z")

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Boost is shutting down its native network. Generally, Boost SIMs now default to AT&T’s network and, theoretically, fall back to T-Mobile where AT&T coverage is lacking.

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### Author: ![mwgardiner](https://forums.rwusers.com/letter_avatar_proxy/v4/letter/m/e95f7d/32.png) [@mwgardiner](https://forums.rwusers.com/u/mwgardiner)
#### Post date: [March 21, 2026, 3:35am UTC](https://forums.rwusers.com/t/boost-sim-reprogrammed-the-curious-may-want-to-watch-for-behavior-changes/1193/3 "2026-03-21T03:35:07Z")

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While I can’t be certain if I’m right about this, not knowing all the programming details of Boost SIMs, this would explain the reboot. My Boost SIM was originally AT&T-only, as far as I know. Rewriting the roaming table to allow connecting to T-Mobile cells is the sort of change that would require rebooting the SIM.

Thanks for the information. I’ll watch for coverage in those few places I don’t usually get Boost service.