Price Research: Our research indicates that this AT&T Samsung A157 Prepaid GoPhone is $10 lower (66% savings) than the next best available price from a reputable merchant with prices starting at $15. - Steveb3163
SGH-A157 Network unlock procedure:
This Unlock method reset cell phone IMEI to all ZERO, most of carriers don't allow ALL ZERO cell phone in their network. such as ATT in US
PS: dial *#06# for checking your phone IMEI
Step 1: Remove sim card from phone and turn the phone on.
Step 2: Dial *2767*3855# This will initiate a Full reset for Samsung A157
Step 3: Once the phone restarts, dial #*7337# This will remove sim lock and freeze
Step 4: Now insert Airtel Sim card. and restart the phone. You will get TMobile signal and will start receiving messages.
Update: It will work on AT&T Sim cards even if it is all 0s. While calling customer care to activate this phone, just say the imei number from the back of the phone below the battery compartment. Don't say that it is all zeros! I am the owner of the blog linked above, and have updated the same info there.
To get IMEI:
Instructions for unlocking with code (thx Lex2000):
1. Power on the phone without SIM card
Replace CODE with the proper unlock code you received.
To check Status of Lock (thx Harold):
For those who couldn't get it shipped any more: This phone Now Available at Amazon for the same price, and free Prime shipping, see here- http://slickdeals.net/f/6225656-Samsung-a157-GoPhone-AT-T-4-99-Amazon-com?v=1
To buy a unlock code for a perfect unlocking.
This seller has the same unlock code for just $1.99, even he didn't mention A157 model in his discription. But I'm sure this $1.99 code works well. just send him the 15 Digit IMEI (with Slash No spaces)