Unlocking the iPhone is often interchangeable with jailbreaking. But they are not definitely the same. Jailbreaking is a program that is done to enable you to use the application approved by Apple that is not on your iPhone. However, before you can open your iPhone, you need jailbreak.
Unlocking in this way means to break a lock on your SIM card and enables you to use your iPhone with carriers that are not only approved by Apple but which network you want. For example, Verizon and AT & T is the only network that you can use your iPhone. By opening your phone, you can use other mobile communications networks in the region or elsewhere.
You must be careful, however, about this procedure, as it presents several risks. First, there is the possibility that your phone can be damaged while in the unlocking process. In addition, you automatically void the warranty on your phone as soon as you opened it. You can request an Apple technical support after you do this.
Official update of the iPhone you will not be easier to install after locking your device. In some cases, you might be able to install the upgrade, but run it on your phone most likely will be difficult and problematic.
However, your iPhone will still work normally even if you open it. There are no other beneficial effects in normal operation after unlocking. Your phone will always be the same features and functions that previously you had changed.