Originally Posted by SpencerNSO
I used to have the same issue. The same fix may fix your's too.
Open the 'Manage Connections' icon
Open the 'WiFi Connections' from the menu list
hit your Blackberry menu key and select 'WiFi Diagnostics' from that menu
Scroll down to the section entitled 'UMA'
about the 4th line down in the 'UMA' section if it doesn't have 'punc.t-mobileuncs.com:14001' next to 'Reg. UNC Address:', then call T-Mobile support and ask them to register your phone on the UMA network.
I see nothing like that under WiFi Diagnostics. The entire UMA section consists of 4 lines:
Connection Pref: Wi-Fi Preferred
UMA Wi-Fi Available - green checkmark
Connection: green checkmark
Status: UMA Connection Successful.
Nothing with a URL.
I just re-installed 4.5 after going back to 4.2.2 I guess I can test to see if it works this time and carries forward any configuration.