I've done a lot of complaining recently about handoffs between EDGE / UMA ... but between EDGE / WiFi when tethering I've had some decent luck I'd say...

So I fired up a constant ping (I'm at the car dealership getting my wife's car serviced) ...

First I'm tethered via EDGE, then I enable WiFi (profile already setup), and then it switches over.

Not too bad ... only one dropped ping, and a total hand-off / negotiation in a few seconds with me not having to drop the dial-up connection.

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Reply from 4.2.2.2: bytes=32 time=1879ms TTL=244
Reply from 4.2.2.2: bytes=32 time=317ms TTL=244
Reply from 4.2.2.2: bytes=32 time=2235ms TTL=244
Reply from 4.2.2.2: bytes=32 time=736ms TTL=244
Reply from 4.2.2.2: bytes=32 time=773ms TTL=244
Reply from 4.2.2.2: bytes=32 time=1955ms TTL=244
Reply from 4.2.2.2: bytes=32 time=458ms TTL=244
Request timed out.
Reply from 4.2.2.2: bytes=32 time=2072ms TTL=244
Reply from 4.2.2.2: bytes=32 time=2066ms TTL=244
Reply from 4.2.2.2: bytes=32 time=191ms TTL=244
Reply from 4.2.2.2: bytes=32 time=92ms TTL=244
Reply from 4.2.2.2: bytes=32 time=113ms TTL=244
Reply from 4.2.2.2: bytes=32 time=107ms TTL=244
Reply from 4.2.2.2: bytes=32 time=112ms TTL=244
Reply from 4.2.2.2: bytes=32 time=111ms TTL=244
Reply from 4.2.2.2: bytes=32 time=96ms TTL=244

So the issue now is just between EDGE2UMA? I wish I could at least see UMA for myself!