MDA t-mo no signal, cingular has signal

[ajeab]

I purchase MDA from TMO, unlock, upgrade ROM to 2.4. But in my office when I have TMO sim in, I don't have signal. I then switch out to cingular SIM and I have signal 2 bars. I then put TMO sim back and try to do manual signal. when TMO and cingular show up i select it but somehow the phone switch back to TMO network again then signal will be lost. Any idea why???

I'm in S. california ZIP 91767
both test done at the same location

[jt_armstrong]

I'm not sure you have described your problem too well, if your using a SIM from 2 different service providers why would you expect both signals to be the same? From the description of your problem it sounds as if your in an area where there is little or no T-Mobile service but some cingular service. If this is not what the problem is can you please have another go at explaining what is wrong. :?:

[ajeab]

well, I'm under assumption that TMO has roaming agreement with cingular. so if my MDA can't lock on TMO tower, it should try to lock to cingular, right??

[jt_armstrong]

Your theory is sound but I have never heard of such an agreement nor have I seen my phone ever display the Cingular logo. I didn't think the roaming thing worked while you were in your home country. Maybe the roaming agreement only covers those states were T-mobile has zero coverage rather than poor or patchy coverage. I'm in SoCal as well so I should get a similar service as you. I would be interested in any info you can dig up on this...