Hello, I have a Droid Razr XT912 running the Jellybean update and for some reason I cannot connect to a gsm network. I understand global gsm capabilities were enabled on the Ice Cream Sandwich update but whenever I pop in a local SIM from where i'm from it, will not connect. I'm from Guam by the way. So my question is how can I get my phone to work with a local carrier? Thanks in advance.