Numerous TMobile lines on my account. All the ones that are upgraded to IOS 17+ the hotspot does not work - it connects but no internet (doesn't say no internet" by the way).
Tmobile support has been no help.
Still works on mine.
Do you use VPN? If so, delete the VPN profile in Settings/General/VPN & Device Management/VPN. Don't just turn it off; delete the profile.
An important fact is that when you install VPN it configures itself to the specific hardware, iOS version and network that the phone uses. If any of those change it can break the VPN. So any time you change any of these you may need to delete the VPN app and profile, restart your phone then add them back (if you still want to use VPN) so it can configure itself to the new environment.
Still works on mine.
Do you use VPN? If so, delete the VPN profile in Settings/General/VPN & Device Management/VPN. Don't just turn it off; delete the profile.
An important fact is that when you install VPN it configures itself to the specific hardware, iOS version and network that the phone uses. If any of those change it can break the VPN. So any time you change any of these you may need to delete the VPN app and profile, restart your phone then add them back (if you still want to use VPN) so it can configure itself to the new environment.
See this thread on TMobile boards for fix. Worked perfectly for me.
https://community.t-mobile.com/apple-8/hotspot-stopped-working-ios17-beta-51278
See specific reply from user mnmacht on how to set ip address, DNS manually.
Tmobile Personal Hotspot Stopped Working on IOS 17+
