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Help! Phone disconnects from cellular while sleeping.

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Senior Member
Jul 3, 2008
For the past month I've had an incredibly annoying problem with my OnePlus 8t (T-Mobile). If my screen is off for a certain amount of time the phone disconnects from the cellular network. Received calls go straight to voicemail. Texts do not arrive. Even when I turn my phone back on I'm not connected to cellular/data. The phone will show I have bars, but no LTE/5G. I have to switch airplane mode on/off to reconnect. I've looked all over and can't find a solution. Any ideas?


Senior Member
Jun 23, 2020
Disable -all- power management including any 3rd party apps.
Try in safe mode to rule out being caused by 3rd party app.
Clear system cache
Network reset
Clear sim card tool kit data
Clear Google play Services data

It's likely a settings or app issue. Unless you did a major firmware update a factory reset is unlikely to help. It may fix it but the issue will likely return.
Find the root cause and correct it instead.