[Q] O2 Note 2 will not connect to network after unlock code
I have a Note 2 which was on O2 I purchased an unlock code on eBay and unlocked my phone using a friends micro sim which seemed to work fine. The only sim card I had is a nano sim so I tried to use one of those adapter trays and broke my sim reader in the process! So I replaced the sim card reader with a new one.
The phone seems to read sim cards now as it does not show the insert sim card error but it is not getting any signal and is showing the error "Not registered on network" when I try to dial. I have checked the hardware and the aerial is connected and undamaged. I have never altered the software on the phone and it is on the stock O2 4.3 ROM and the phone is not rooted.
Any ideas because I am at a loss...