Aside from enabling the owner the ability to consider different network providersas opposed to just their current service provider, there's a couple of other explanations as to why you might need to permanently unlock your cell phone before your contract ends. For anyone who is moving to foreign countries for example, you'll probably decide to make use of a domestic SIM card while you're there to prevent steep roaming charges. Or maybe you've decided to sell your smartphone then you'll probably get extra cash and a lot more interest in a mobile that's free to make use of with every network.
There isn't anything unlawful about unlocking your cellphone. It's your phone and you are obviously within your rights to make use of it with any network you choose. Yet, there's a good chance permanently unlocking your mobile phone will probably end your warranty, so it may very well be best to hold off until you have completed your contractual obligations before you make your mind up to abandon your existing network.
When your phone has been unlocked, you're ready to find one of the lowest priced cellular services available - a sim-only deal. Most of these usually operate on a rolling month-to-month basis, meaning you can utilize the package for so long as you are content with your cell phone and then update when a sparkly new handset catches your eye or your good old mobile at some point won't play ball any longer.
If you are unsure who's a genuine company and who is not, I highly recommend Unlock.Zone. They offer unlocks for all major brands and networks, provide a guaranteed price match promise, and most significantly, offer a no questions asked refund policy in the unlikely event they cannot unlock your cell phone. I've used them myself and was really happy with the service I received and ultimately that they successfully unlocked my smartphone.
Visit their site by following this link: IMEI Unlock My Phone Myself