Can you use a cingular sim in a t- mobile phone?
If you are trying to use the T-Mobile phone with your Cingular SIM, and maintain your Cingular service, you will have to call T-Mobile to get a Subsidy Unlock code, and unlock the phone to be used with Cingular's service.
No you cannot, but you can use it in an UNLOCKED T-Mobile phone. Cingular and T-Mobile work off the same network which is GSM and this allows you to switch phones. I have T-mobile but the phone I am using right now is an unlocked cingulart phone. Nextel/Sprint and Verizon work off of the CDMA network and this is why you cannot use it.
An unlocked AT&T phone WILL work with a T-mobile sim card. I have an AT&T Razr that works with either AT&T/Cingular or T-mobile, depending upon which sim card is inserted. I called AT&T/Cingular customer service to get the unlock code for my phone - in California, cell-phone companies have to give you the unlock code if your account's been in good-standing for at least 90 days.
On some t-mobile phones you can use your cingular/at&t sims card,but on some phones after putting a t-mobile sims card in a cingular phone may cause the phone to lock up.....BUT u can unlock your phone by calling your network from another phone or logging on to your account on the internet(I PERFER CALLING YOUR NETWORK).You can also unlock it but putting another cingular sims card back in a cingluar phone then your phone should…
N you cant use a t mobile phone with Verizon because it the t mobile phone has a sim card and the Verizon doesn't take sim cards. No you cant use a t mobile phone with Verizon because it the t mobile phone has a sim card and the Verizon doesn't take sim cards. This is not true Verizon does have sim cards look it up!!!!!!!!!!!!!!
SIM Cards are made to work in any mobile phone. But some mobile phones especially if bought from a mobile phone operator are blocked and work only with a SIM of the operator who sold you the phone. An exception is that some rare phones like iPhone 4 use Micro SIM, therefore a normal SIM just doesn't fit.
I just unlocked my phone. and put an optus sim in it to make sure it was unlocked. will the phone be locked to optus now?
What is use of sim card when you switched on the mobile phone why it say insert sim card what is the first function of sim card when you switch on the mobile phone?
SIM (Subscriber Idendity Module) is the only idendity of Service Provder on your mobile handset. It means all the credentials and secrect Keys related to network Authrization are stored in SIM card. When mobile is booted up first thing it will do is to search the Network, The network name is stored in the SIM. When it finds the network then mobile will attempt to authorize on this network using Secret keys stored in the…