I have restarted my phone and ID mobile emailed me to say they have switched but I see see my old network on my phone.
I can’t use my phone accept for wifi

I have restarted my phone and ID mobile emailed me to say they have switched but I see see my old network on my phone.
I can’t use my phone accept for wifi
Best answer by Matthew T
If you're using iOS or iPadOS 15 or later, tap Settings > General > Transfer or Reset [Device] > Reset > Reset Network Settings. If you're using iOS or iPadOS 14 or earlier, tap Settings > General > Reset > Reset Network Settings.
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.