ATT 8525 Phone Connectivity Instable

Symptom:

I have been using ATT (Cingular, HTC) 8525 for sometime, but whenever it switches to and from 3G to GSM (EDGE) networks there have always been all sorts of problems like a call dropping, cannot connect re-establish data connections etc. It also seems to get worse from either other networks, towers or a situation where there is an GSM only tower near-by and 3G tower at a receivable distance.

Fix:

I have disabled 3G from the phone and it operates much more stable. There is a registry hack you can do to show the bandwidth selector.

To enable the bandwidth selector tab in the Phone setup page.

[\HKLM\Software\OEM\PhoneSetting\]
"ShowUMTSBandPage"=dword:00000001

And this disables it.

[\HKLM\Software\OEM\PhoneSetting\]
"ShowUMTSBandPage"=dword:00000000

There is a freeware called MobileRegistryEditor that you can install it on your desktop and you can "remotely" alter the registry keys via a USB connection.

As with any registry hack, I cannot be responsible if you screw up your phone permanently.