Unlocking an iPhone and not using a provider means that you can apply it to any community, whatever the one it was initially locked to. This may be helpful if you wish to swap carriers, use your iPhone internationally, or promote it to somebody who makes use of a unique provider.
There are just a few alternative ways to unlock an iPhone and not using a provider. A method is to make use of a third-party unlocking service. These companies sometimes cost a price, however they will often unlock your iPhone shortly and simply.