Unlocking iPhone 5s (or even iPhone 5)

I'm planning to buy a locked iPhone 5s (or even iPhone 5).
So is it alright to unlock it from outside? like will everything go well after unlocking the device?Will be ther any issue based on the country it is bought or any other thing that needs to be taken care off?
Please if any one have any information regarding unlocking the iphone and the after effects, post a reply. :)
Also, a proper reasonable definitive and honest place/website from where the device can be unlocked? Thanks.

Comments