Re: I have an ATT Samsung SHG AA37 phone and I have...
Have a friend with a different cell phone company (like verizon, t mobile) take out their sim card, put it into your phone & turn yours on. then give theirs back & put yours in again. this should unlock your phone. good luck!
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Let me give you a little background and then some solutions. This is generic because I don't know your carrier. I've used ATT as an example.
Phones are naturally unlocked, but a service provider might lock them
When originally manufactured, all GSM cell phones are unlocked. That is, they can be used with any SIM from any cellphone service provider - always assuming, of course, that the cellphone service provider has compatible GSM service on the same frequency bands that the phone can operate on.
Most cell phone service providers electronically 'lock' the phone so that it can only be used with their service. There are obvious reasons why they choose to do this - in particular, to force you to pay what are usually very high roaming charges when you take your phone out of their network and use it elsewhere in the world.
Fortunately, this locking is reversible. With some phones, it is possible to simply enter an unlocking password code into the phone and it is immediately then unlocked. Other phones need to be connected up to a special unlocking data terminal.
Your phone has to be unlocked by the carrier. LG, Motorala, Sony Ericsson, Samsung, Nokia and most of their ilk, will not give consumers the unlock codes but don't despair.
A PUK (PIN Unlock Key) code is required to unlock SIM cards that have become locked following three successive incorrect PIN entries. If your SIM card becomes locked, you will need to get a PUK code from your carrier. For example, if you have AT&T to unlock your SIM card, you can obtain your phone's PUK code from AT&T by:
logging in to your myWireless Account online
using their Technical Support Chat
calling Customer Care at 1-800-331-0500
To get your phone's PUK code online from ATT:
Log in to your myWireless Account.
Select My Services under My Account.
From the My Services screen, select My Phone/Device.
Select Unblock SIM Card.
The Unblock SIM screen will display your PUK code.
Once you receive your PUK code, you will need to enter it into your phone to set a new PIN code.
Note: If you enter the wrong ATT PUK code 10 times in a row, your SIM card will be invalidated, and you will need to purchase a new SIM Card. The phone will display the following error: "PUK blocked call operator."
There are three other ways to unlock a phone:
The carrier will unlock the phone for you at one of its retail outlets;
You may contact to your service provider Samsung SHG T401g Unlock Code for unlocking your phone. I suggest to visit Samsung Unlock Code site, they will provide you an accurate code fast with easy to follow instructions on how to unlock your phone. Once your phone is unlock, it will work with any network worldwide without sticking to one network. It really works....
if you already tried to enter a code 3 times, your sim card needs to be replaced, go to a retail location att and they will give you one free. Otherwise if by chance you did not put in any code, call att and tell them you need the puk code. they can give it to you
I had the same problem, first off let me tell you. DO NOT TRY TO UNLOCK THE PHONE. Don't try and guess the code or anything like that. If you get it wrong more than 10 times, your SIM card is wiped forever.....let me say that again FOREVER. Call the service line with another phone and they'll be able to give you the code to unlock it.