Yesterday 03:57 PM #13
I never put he SIM card in my phone so I didn't have a problem with 4G until the ICS upgrade yesterday. I thought it might be a signal issue until I talked to a friend today. He had the same issue with his Razr going to 3G. He found that his phone was defaulted to Global. After clicking on Settings enough times I found that going to Data Usage, More, Mobile networks, Network Mode and checking LTE/CDMA it stays in 4G. I just did this so I can't be sure that it cures it but it sounds logical.