Unlocked Centro cyling "Roaming" "T-Mobile"

[bciocco]

I purchased an unlocked Centro (previous AT&T) for my wife in January. Last week, the carrier on the phone page started cycling between T-Mobile and Roaming.

I used my unlocked (also previously AT&T) Palm Treo 650 for a week and it was doing the same thing. It still would be if I didn't just (tonight) upgrade to an unlocked (previous Cingular) Treo 680.

Any ideas?

[Nextel32708]

Check the network settings.

See if it is set to 'manual' or 'automatic'. Also check to see what the "search speed" is...

[bciocco]

I have tried manually selecting T-Mobile and the automatic mode.
Where do I find "Search Speed"?

[bciocco]

I went to the T-Mobile Store today. I had an old SunCom 3.0 SIM card in the phone, so we tried a new T-Mobile 3.? card. The cycling stopped, but I was not able to receive calls for a couple of hours. After two and a half hours, calls were able to come in and they were associated with their assigned ringtones.

So, it looks like the SIM card is the fix. I will know better in a few weeks. If it is the fix, I'll need to get one for my phone too. I think it is roaming, even though it isn't flashing.

BTW - both Treos are ex-Cingular. The 650 is not ex-AT&T as stated above. The Centro is the only ex-AT&T.