I purchased 2 pearl flips a few days ago along with the T-mobile @Home service (wireless router). One phone shows I am connected with the wifi UMA service but the other shows the EDGE connection. On the phone that is not connected with UMA, I checked in the WiFi Diagnostics and it shows "UMA WiFi avaliable" but no connection (with error code w006.1). I have the Connection Preference for both phones set to WiFi Prefered. Any ideas why one would use the UMA and the other would not?

Do you have a limited number of IP addresses available? On my router, I have it set up for 7 IP's (the IP's aren't specified per device but the total number of IP's available is specified), i.e. 5 wired desktop PC's, 1 wireless laptop, and 1 wireless phone. If another device tried to connect to my router, it likely won't be able to unless my laptop and/or phone is off and the IP lease had expired.

Unlikely but worth a shot...

Do you have separate SIM cards for each phone, with a separate data plan for each?

How would I check this in the router config setup?

Yes, each cell phone has its own sim card and the tmobile router has one as well (it's a Linksys). And each cell phone has its own data plan

Try a battery pull on the phone that can't connect to UMA. Maybe it's some "glitch."

I just tried this and no go...same thing...but my wife's phone connects just fine.