How Do I Unlock A Att Sim Card?

You will need to obtain a PIN Unlock Key (PUK) in order to unlock the SIM card on your AT&T cell phone. To get this, you need to firstly turn your phone on by pressing and holding the 'power/end' button for around two to three seconds. When your phone has booted up, an 'enter PIN' message should appear on your phone screen. You should attempt to unlock the SIM by first entering AT&T's default PIN which is 1111. If that doesn't work then try the last four digits of your cell phone number. If your phone will still not allow you access then just enter any PIN and the phone will register that you have had three failed attempts. The screen will then display 'enter PUK'.

In order to receive this number you should call AT&T on 800-331-0500 and request the PUK code for your phone from the customer service representative on the phone. Remember to have your account password at hand because they will ask you for that along with your cell phone number. However, if your phone is registered online you could log in to your account and click on 'unblock SIM card' and it will give you the correct PUK code. The code will be an eight digit number which you should then enter into your phone using the keypad and press 'ok'. You will then be asked to enter a new PIN which can be between four and eight digits. You will then be requested to re-enter the PIN and then press 'ok'. The SIM card should now be unlocked.

I bought a new phone, & I put my sim card in it, but I have to unlock my sim card which I don't know that password too, because we never set a password, but my sim card still works in my old phone. How do I unlock it?

My sim card is lock how can I unlock it

Unlocking is not possible, you must buy another one for $25.00

Please my son has pressed something on my phone and the phone is now requesting for PUK number.

My SIM CARD QUit ANd NOW SAYS INSTaLL SIM And EmERGENcy calls only what does this mean And hoW do I fix it

I have a g1 but a at&t sim card I need a unlock code for it

In this case you can use their contact option from their website and they might also require you to visit their service station for some identification. Since your Unlocking Key is only available from your operator, you must contact them either from above mentioned options or from any other AT&T number.

I locked my sim card and don't know to do

I used to be on vodaphone but as I could go on any network I went on to 02 ,so I got my self a 02 sim and I put it in my phone and it come up with   sim lock enter password but I don't remember having a password for it   and I trew my vodaphone sim away WHAT DO I DO ! ?