Recently I bought an unlocked Nokia Icon. It is unlocked, so I assumed it would work with my carrier just like my Nokia 920. I turned it on, transferred my number into a micro SIM. It was working perfectly. Then I updated my phone, and it was still picking up my carrier. Now all of a sudden it says invalid SIM/Missing SIM card. I can't download Access Point and I can't change any of the APN to my carrier's. Can anyone help?