Are Tele2 and T2 the same scenario?
For troubleshooting, yes: mention the current carrier brand, city and device type.
On Tele2/T2 issues often look like timeout, endless connection or no internet after the connected status. Start with profile refresh and network comparison.
VPN works at home but not through the SIM card
the client connects but pages do not open
only switching network or LTE/5G mode helps
the error repeats after phone restart
Refresh the WersidePN subscription in your client.
Try the second profile if the app shows it.
Turn off Private DNS and other VPNs, then reconnect.
For troubleshooting, yes: mention the current carrier brand, city and device type.
A screenshot, phone model, client name, city and whether Wi-Fi works.