Chosen Solution
So my old LG G4 (H815 Factory Unlocked) isn’t playing ball with my Boyfriends 3 Sim. The phone is confirmed Unlocked and I’ve been able to use my GiffGaff sim in the phone which further confirms it’s unlocked. However it refuses to accept a 3 sim (Both my new 3 Sim; his and one from the store) I’ve tried factory resetting the phone a number of times, rebooting, opening it up and inspecting the prongs. Nothing; any advice? I’ve also fiddled with APN settings and LTE/GSM settings.
While this is likely a hardware issue with the cellular radio, try another SIM card. It doesn’t need to work, so use a dead SIM that’s been deactivated or an expired T-Mobile SIM. The other option is to buy a prepaid SIM card kit from Net10 or Tracfone since the phone isn’t carrier locked. If you continue having issues, there’s a problem with the cellular radio or SIM slot. If you’re comfortable with board level repair, you can try to troubleshoot further. f you are not, then you’re going to need a new motherboard.
