I've just recently gotten the Samsung Droid Charge and activated my SIM card on it, but for some reason, it will not connect to the 4g or 3g network even when mobile data is on. I know my SIM card works because I can make calls and text, but I cannot browse the internet. I've tried going to settings and enabling mobile networks, turning airplane mode on and off, and even enabling roaming, but nothing seems to be working. I can connect to a WiFi network perfectly fine. It just won't connect to the Verizon network. Is the phone defective or am I not doing something that I should be doing? Thanks for the help.