I switched from the TB to Charge and love it. I am very happy with the battery life. On the TB I used Phone info to turn the 4 g off since I do not have it yet in my area. I thought I would try that on the charge. When I use the app, it lists our service as "unknown." When I switch to CMDA auto for 3 g only, it stays for a short while, then goes back to "unknown." I cannot seem to get the 4 g off. Suggestions?