Of course you can. T-mobile, AT&T, and Cingular are available.
You can go to customer support and request it if you are off of contract (an possibly the original owner), or use an internet service like iFactoryUnlock which can to AT&T in the USA but not T-mobile iPhones.
Yes
Take the phone to a retailer who specialises in phone unlocks.
Take the phone to a retailer who specialises in phone unlocks.
Take the phone to a retailer who specialises in phone unlocks.
You can unlock your iPhone 3Gs anywhere if you have internet:)
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.
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.
You first turn your iPhone on, then slide to unlock, click on the camera app, then click on the camera icon towards the bottom of the touch screen to take a photo.
From iPhone 4 and beyond you can use simple software to unlock your phone. The 3GS is not able to unlock your phone unless you buy a special SIM card or take it to a different carrier