To get a permanent unlock from a trusted vendor I use iFactoryUnlock.
They can do AT&T in the USA and a bunch of other networks world wide.
So far I have used them for 3GS, 4, and 4S unlocking on AT&T and T-mobile UK.
hope that helps!
www.ifactoryunlock.com
Read more: How_do_you_transfer_music_on_to_a_Verizon_blitz_on_a_mac_without_a_micro_SD_card
You can unlock your iPhone 3Gs anywhere if you have internet:)
No. You only need to unlock an iPhone if you want to use a different cell phone company with your iPhone.
The link below is the needed software to unlock the iPhone.
you can unlock any iphone or phone at unlock att .com i did my whole familys iphones there
To unlock iPhone 3gs on iOS 4.1 you have jailbreak your device first.
Depends on your software version if you even can unlock.
The Unlock codes for iPhone 4 to unlock the service network is usually provided by Vodafone who usually verify the information with Apple.
You can use unlock tools such as MagFone iPhone Unlocker to unlock your device, MagFone can easily unlock your iPhone within 3 steps. At first, you need to connect your iPhone and click Remove Screen Lock. Then confirm the device information and get the firmware package. In the last, click the Start button to remove passcode from iPhone.
No, you can even unlock the iPhone when Jailbroken.
If you can't open your iPhone 5c because you forgot the passcode, maybe you can try MagFone iPhone Unlocker to unlock your device. You can easily unlock your iPhone within 4 steps. The first step is to connect your iPhone with the computer and open MagFone iPhone Unlocker, Then put your iPhone into DFU Mode or Recovery Mode, download and verify the Firmware Package. The last step is choose to Unlock your iPhone without Passcode.
Yes
When you are at the lock screen, follow the "slide to unlock" message by sliding the screen to the right. Then input your passcode.