Switching T-mobile to AT&T - MDA, XDA, 1010 General

I have T-Mobile PPC phone and will be switching to AT&T service soon. My phone is unlocked so this is not an issue.
If anybody has already gone through this is it worth to upgrade both radio and ROM to AT&T versions or leave T-Mobile in place? Any other issues I shall be corncerned about?

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if you are going on to ATT and plan to use their GPRS you may want to upgrade as the siemens upgrade is the lates so far and include ATT's proxy setting to get a little xtra compresion of stream. In addition ATT uses variation of GSM standards you will get the best experience using their radio stack. You can still use T-Mo's but your GPRS will be flaky as hell. :?

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not sure if i get this right...
i was under the impression that tmobile uses 1800mhz and att uses 1900 that is why the A adnd B models for tmobile and ATT respectivelu,
if i understand this right u wont be getting the best of signal strength even though it might work!!
some one correct me if i am wrong

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Some people manage to get a passable signal but most cannot manage to keep a signal outside of the hardware band, try tuning a radio station 100 mhz off tune and see how it sounds. You will be operating outside the band and at best it will be flaky, at worst it just wont work.

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tmobile using 1800mhz/Att 1900mhz.
rc said:
not sure if i get this right...
i was under the impression that tmobile uses 1800mhz and att uses 1900 that is why the A adnd B models for tmobile and ATT respectivelu,
if i understand this right u wont be getting the best of signal strength even though it might work!!
some one correct me if i am wrong
Click to expand...
Click to collapse
This is the first that I have heard this, but believe it. I went from AT&T to T-Mobile, and it works, but not near as well as ATT. Is there a way to switch it to the 1800mhz, or is this a hardware setting? I don't want to get ride of my SX56, I love it, but I do need better quality.
Thanks,
Darren

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rc said:
not sure if i get this right...
i was under the impression that tmobile uses 1800mhz and att uses 1900 that is why the A adnd B models for tmobile and ATT respectivelu,
if i understand this right u wont be getting the best of signal strength even though it might work!!
some one correct me if i am wrong
Click to expand...
Click to collapse
You're wrong. The A/B models differentiate the North American market from the rest of the world. It's not ATT vs. TMo.

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i went from att to t-mo the first day possible. given my experiences with att and t-mo i would STRONGLY encourage users to skip att and go with t-mo if the two are your consideration set. att's service is horrible and cust service even worse. t-mo has been better all around, unless you're trying to make and receive calls from rural areas.
t-mo is the way, imo.

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I agree that customer service in TMo is great, the only problem is that I don't get any TMo signal in my office while AT&T shows full strength. So I don't have my choice.

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I'm a recent switcher
Although i had good experiences with T mo. I recently switched because i needed a family plan that gave me the most minutes. So far customer service has been horrible but, phone service has not been an issue. As for upgrading goes i had no problems. All i did was download and install the ROM upgrade via sync cradle. Of course since that i've install the 4.00.5 ROM from Yorch's kitchen.
Advice: stick with T Mo. if you can however, ATT is an ok alternative if you don't have to call customer service.
FYI: Cingular is purchasing ATT wireless. maybe it will be for the best.