I have two N9 one of them cannot connect to the Tmobile US GSM network. The other has no issue connecting. It wouldnt be location, since they are side by side. One gets service the other doesnt.
I have tried rebooting the phone still cannot connect to GSM.
Strangely enough the phone will work in 3G mode and Dual mode but it still connects to 3G. I also noticed that when selecting the network manually with the phone set to GSM mode only. It is able to scan for Tmobile and ATT networks but wont let me register. "Sorry you cannot use this network"
The reason for GSM mode is because i use profilematic to save power.
I hate to reflash since some apps can no longer be download from the store.