I have an Siemens SX 56 that will not read my sim card and its from att the phone keeps on saying locked Sim needs unlock code can u help I have tried everything the IMEI is 350314001078774

Ive noticed a lot of att phones that want unlocked for a different provider sim or phone is asking for unlock code. If you are trying to use a different providers sim card in the phone you will need to call att and answer a few simple questions and theyll give you the code and how to enter it into the phone. Dont keep entering codes in or it will permanently lock it to the network. If you already have att and your phone is asking for a puk or an unlock that you dont remember using youll also need to contact att. The puk they will be able to give if your able to verify your account, CAUTION do not keep entering in numbers for the puk code if you enter it in 5 times wrong youll lock it to the network and need a new sim/phone. If your phone is asking for an unlock code, its most likely one youve made up but if you dont remember making one up you can call att and they may be able to give you a default code, or find a way to get the code you need.