How to unlock iPhone 4s (UPDATE)

this are more instructions that workit for outer people

it Insert original carrier AT&T SIM card
Dial 611 for AT&T customer service hotline and drop the call
Turn on Airplane Mode
Take out AT&T SIM card
Insert T-Mobile SIM card
Make sure WiFi is off ( also tap on 'Forget this Network" to make sure it doesn't connect automatically later)
Switch off Airplane Mode and iPhone will search for network. This is followed by the Apple splash screen appearing.
Activation Required will be displayed on the screen
EDGE network will activate automatically -- notice the 'E' on the top left corner of the screen
Wait for about 20-30 seconds and turn off the phone
Turn on iPhone and the same Activation Required screen will be displayed
When you see one signal bar, tap on Use Cellular Connection
Eject SIM card
Activation Required screen will be displayed the second time
Insert SIM card
Unlocked!

for T-Mobile Internet and picture messaging:




From the main menu, tap Settings.
Tap General.
Tap Network.
Verify the following settings:
Data Roaming: On
Wi-Fi Off
3G Enable Off
Note: The Apple® iPhone® is missing the WCDMA 1700/2100 band, and cannot function on the T-Mobile 3G network.
Note: Changing the 3G Enable function while the device is on an active call may cause the call to disconnect.
Tap Cellular Data Network.
Configure as follows
APN epc.tmobile.com
Username Leave Blank
Password Leave Blank
Enter the following information under the MMS section:
APN epc.tmobile.com
Username Leave Blank
Password Leave Blank
MMSC mms.msg.eng.t-mobile.com/mms/wapenc
MMS Proxy 216.155.165.50:8080
MMS Max Message Size: 104857
MMS UA Prof URL www.apple.com/mms/uaprof.rdf
Press the Home button to return to the Main Menu.
Press the Home button to save the APN and exit to the main screen.

Test the connection by opening the Safari web browser.

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