I recently purchased an unlocked AT&T HTC Inspire. I activated a new T-Mobile sim card and signed up for one of their 4G plans. I was able to make phone calls but no internet. I called T-Mobile tech support for help. They took me to settings>wireless&networks>mobile networks>access point names. I filled in all the info in all the places they told me to. I shut off the phone, removed the battery and sim then replaced everything and booted up the phone. For awhile I was able to get "Edge" connection but then everything quit working. No network or data connection! Back in settings one of the network tabs has been disabled and I can't click it to reconnect to the network. What the heck did those T-mobile "techs" do to my phone? I've done the factory data reset option but that network connection tab is still disabled. Any help with this will be greatly appreciated.