I can connect via WiFi, but no UMA (in Los Angeles).

WiFi Diagnostic from B8900:

Wi-Fi
Current Profile: zzyx
SSID: zzyx
AP MAC Address: 00:18:...
Security Type: Pre-Shared Key (PSK)
Local IP Address: 192.168.0.18
Signal Level: -61 dBm
Connection Data Rate: 48 Mbps
Status: Network acquired

VPN
Current Profile:
Concentrator Address:
Contact: N/A
Authentication: N/A
Secure Device IP:
Status: VPN disabled.

UMA
Connection Pref.: Wi-Fi Preferred
UMA Wi-Fi Available: Successful
Connection: Error
Error Code: W006.1
Status: ISP or T-Mobile Network error.

Enterprise
UIDs:
Connecting: Error
Authenticating router: N/A
Authenticating server: N/A

BlackBerry Infrastructure
Connecting: Successful
Authenticating router: Successful
Authenticating server: Successful