Solved - My phone works only on T-Mobile sim and not on AT&T
 

Hi,

My N900 got delivered today and had inserted my currently working AT&T (3g) simcard for setting it up. Surprisingly, N900 gave a 'Sim Card Not Recognized' error.

I tried with my friends T-Mobile sim and that worked flawlessly!!!!

Also my current phone which uses the AT&T sim is the Nokia e71x which is same as the e71 but has been heavily customized by AT&T. Could this be the reason ?

Will try a different AT&T sim soon but it will be great if i get a few pointers from you guys :)

Thanx
--
Sidd

Re: My phone works only on T-Mobile sim and not on AT&T
 

n900 only works with tmobile's 3g bands

Re: My phone works only on T-Mobile sim and not on AT&T
 

N900 works fine with AT&T network just doesn't do 3G might be the sim card.

Re: My phone works only on T-Mobile sim and not on AT&T
 

In your phone settings for the N900 make sure that the network mode is set to GSM or Dual and not to 3G. The N900 only runs on ATT's EDGE network so your data transfer speeds will be slow.

Re: My phone works only on T-Mobile sim and not on AT&T
 

I used my N900 with my AT&T SIM just fine before I switched to T-Mobile

Re: My phone works only on T-Mobile sim and not on AT&T
 

Thnx guys for the super fast replies...:) Will definitely try what was suggested by 'mobiledivide'...

But my only concern is that atleast the sim should have been detected inspite of being an AT&T 3g type.

--
Sidd

Re: My phone works only on T-Mobile sim and not on AT&T
 

Mine is a AT&T 3G type that came out of my iphone and it works in it.

Re: My phone works only on T-Mobile sim and not on AT&T
 

So then what could be the problem with my N900 ? It works perfectly fine with T-Mobile sim :confused:

Re: My phone works only on T-Mobile sim and not on AT&T
 

i have n900 on att, and at one point it said this "sim error"

i looked at my phone and was like ... wtf...

i restarted it and it was fine. Mine is set on DUAL mode.

works surprisingly well on EDGE btw

Re: My phone works only on T-Mobile sim and not on AT&T
 

i too went from a 3g at&t sim card to tmo, and when i was using the at&t sim in my n900, it only worked as mentioned above when the phone is set to "GSM". otherwise it does not detect 3g at all.