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Yes, on an unlocked phone you can easily switch SIM cards. All you can do is put the T-Mobile SIM card in the phone and it should show signal bars on the top of the phone. If not you can call up T-Mobile and ask them for correct network settings and they should be able to help you out with this.
If the phone is not unlocked it wont work with any other sim card except the original carrier SIM card. In this case you first need to unlock it.
I am posting the link below incase you need unlock code for your device:
Hi,did you inserted your t-mobile sim into your samsung mobile and then too does it displays at&t? if so it means that its locked to at&t network...you have to unlock your mobile to use your t-mobile sim..for unlock codes you can try at&t or can get it from online providers..once i got unlock code for my mobile from classicunlocking and unlocked
my mobile..you can too try getting codes for your mobile and get it
unlocked..but before that check whether unlock codes for you country and
There are several ways for unlock mobile phones, but codes are best one, because it is easy and safe also, you can get the unlock code for your Samsung model mobile, through this site http://www.mobileunlocksolutions.com/samsung-saga/rs1wp9/ It has the step by step instructions and easy methods for unlocking your mobile phones............
Here is two possibility either you used sim in wrong slot like you have nano sim and you used into micro sim slot or other different slot. or your mobile is sim locked and that is why it not accepting at&t sim. here is how to unlock at&t simcard.
As your att sim working fine with blackberry so sim is fine no issue with sim card. on which mobile you have tried this sim as you have not mentioned your other mobile it is same as blackberry or apple or samsung mobile.
I also have a x426 from 2003 and it wont work with the new ATT sim cards either, This is because of the Cingular/ATT merger which created a new network. The older original ATT phone must be unlocked to use a sim card from the new merged network. Try calling ATT Mobility customer service and request the subsidy unlock code. They are required to give it to you upon request, but it takes several days usually to get the code. I know because I used to work at a ATT call center.