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My 6T (unrooted) Android 10.3.5, won't tether - not by USB, not by Wifi nor by Bluetooth.

Not a carrier issue - I can tether with my wife's phone.

Weird behaviour - occasionally the tethered device (PC) will have internet, but not the phone, sometimes the phone will have internet and not the tethered device.

I have AdGuard and NordVPN installed, but I turn them both off before trying to tether.

I have disabled Private DNS before trying to tether.

Doesn't work in Safe mode either. Shows connected device to hotspot on phone.

If I connect the phone to Wifi then the PC has internet and the phone does also - not very helpful.

It used to tether months ago.

Any ideas please?

  • See routing table (using ip) and firewall (using iptables) when tethering turned on. The simple way to troubleshoot networking issues. Latter requires root. – Irfan Latif Aug 3 at 14:48
  • Out of curiosity, do you happen to have any battery optimizations enabled, or any installed apps that purport to make your battery life more efficient? – CzarMatt Aug 4 at 3:43
  • No battery optimization apps - OnePlus is aggressive enough without help and offers good controls. FYI - I found the answer below - thanks for your interest @czarmatt – Edwin Aug 4 at 16:11
  • @IrfanLatif Thanks, I made a note of that tool for the future – Edwin Aug 4 at 16:13
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Editing the APN didn't help. Recreating a new APN from scratch resolved the issue - even though they look identical to me on the screen. Leaving here for others to hopefully benefit.

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