We took a iphone from home to Europe, with a Travelsim inserted (for use with European networks). All went well when in Europe, but when we got home and re-inserted our normal sim, calls and SMS work, but Mobile data doesn't.
When I go to Settings, the mobile data section has no option to change APNs etc, but when I re-insert the Travelsim, the options for APNs re-appear and display the various manual settings for the Travelsim. Some could be deleted, others just came back into the fields.
I have reset the Network settings (Settings>General>Reset).
I have done a reboot with the home sim in.
Home sim works in my Galaxy.
Any suggestions would be appreciated.