I have just moved to ID on a sim only deal. I have 2 phones and 2 sims. one sim is ok but mine isnt able to connect for some reason so I can only use wifi. I have tried the following:
- Put your phone into flight mode, leave it for 30 seconds, and then disable flight mode
- Check that the SIM card is inserted correctly.
- Restart your device.
- Turn off your device, remove your SIM, and clean it using a micro-fibre cloth. Then re-insert it and try again.