It's different depending which method was used to unlock it. Refer to the website where the package was downloaded to determine how it should be done.
If you unlocked your iPhone it is easy to access apps store all you need is a account to download thinks from there,if you jail braked your iPhone you may download thinks through cydia only .
Simply update ios
Jailbreak your iPhone
Yes. If you update your iPhone's software using iTunes it will lock your iPhone again. You will then need to unlock it again.
If you unlock it by jailbreaking it will. Jailbreaking alone does not allow you to use another carrier's SIM card in the iPhone. It has to be jailbroken and then unlocked. Once you jailbreak it then Cydia will be on the device and then you go in to Cydia and run Ultrasn0w to unlock it
A guy unlocked my iPhone 4S from Sprint and he said that if I update the ios then I wont be able to use my phone. It's currently on ios 6.1.3. I know most things about iPhones except for unlocking and having to do with carriers.
you go on a website called jailbreakmatrix
No
Yes but your iphone has to be jailbroken and have Cydia.
I believe it is the same thing.
click on Restore in Itunes
You can visit apple.com or visit a local apple store for unlocked iPhone.