iPhone stuck in an activation loop
We currently have an IPhone 6 plus that is stuck in an activation loop. Whenever you turn the device on it goes to the hello screen to go through the setup process. If you set the phone up with a sim card inside it will revert back to the hello screen as soon as you reach the home screen. If the phone is set up with out a sim card it will work fine until you insert a sim card. Once you put a sim card in it will reset and start the activation loop again. I have tried multiple restores both standard and DFU mode so it isn't software related. Does anyone have any idea what might be causing this and how to fix it.
Thanks in advance