Only started happening today. Went somewhere and started on 4G.
When got to place, handset had 5G symbol but there was no internet, nothing would load. Put phone into aeroplane mode and back and internet is working again.
Get home, in a 4G area, had wifi off, again no mobile internet. I haven’t tried aeroplane mode as turned on wifi this time. If aeroplane mode going to be needed each time change zones, going to be a pain.
iPhone 12 max pro, brought from Noel Leemings. Up til today there has been no problems changing zones so don’t know what has changed. The 4G and 5G symbols were visible, just nothing would work.
Edit: I turned wifi off, the 4G was working, but very slow. YouTube wouldn’t load and Geekzone was 15 to 20 seconds a page. Put it in aeroplane mode and back on and it went back to full speed.