What is an unlocked iPhone 5, what's the difference? - 1

Is any problem in unlocked phone and what's the advantage of unlocked phone

You can download any app from internet and not pay for it.

"You can download any app from internet and not pay for it." - that's a jailbroken iphone.

An unlocked iPhone is where it can be used with any sim card such as tmobile, vodafone. The advantage is that anyone can use this and if you are selling it, its worth more due to more people being able to use this.

http://ipod.about.com/od/ipodiphonehardwareterms/g/unlocked_def.htm

You can use an unlocked iPhone 5 with it's existing network or switch over to any other supported network.
Eg: You can use Vodafone, AT&T, T-Mobile etc. In an unlocked phone.

The main advantages of unlocked phone are as follows:
a) Switch to any other network: Once you unlock your phone you can switch to any other network and use the same phone.
b) Cut roaming costs: With an unlocked phone, you can go to any country/state and save money by using a local network rather than paying high roaming costs to your home network.
c) Higher resale value: Unlocked mobile phones generally have a higher resale value than a locked phone.

If you need to unlock iPhone 5 visit the site http://www.theunlockarena.com/apple-iphone-5/rs16wp9/ here they are Remote Unlocking service at low cost. Using that you can unlock your phone easily. After Unlocking you can use freely any GSM SIM card. This is the easy, safe and permanent unlocking method.

I have also recently buy iPhone. But not fully aware of unlocked iPhone. I think you need to go on this link http://www.mobile2tek.com/iphone-support/.