From Orange County, Californai, here are my speeds using Time Warner cable modem in an Airport Extreme Base Station wireless network:
Connection Type: Download: Upload:
WiFi 5801 Kbps. 983 Kbps
AT&T 3G (5 bars). 733 Kbps. 25 Kbps
EDGE (Tmobile MyWi). 79 Kbps. 95 Kbps
Odd that the EDGE connection has faster upload speed than the 3G connection. Either way, I would need to be REALLY in need of an Internet connection and outside an area AT&t serves if I decided to use my MyWi connection on my unlocked/jail broken iPhone.