Locked and Unlocked Cell phones

Answer 1

 Locked Means You cannot use the Phone in other Network But Unlocked means you can use it any GSM Network Sim Cards,If it locked mean unlock it here http://www.theunlockarena.com/supported-phones/rs13wp7/ using the Unlock code.

Answer 2

Locked phones have restrictions on them by the service provider, which would just allow the user to use it on that particular carrier, while in unlocked phones, the restrictions are removed. With the restrictions removed, the user can use the phone on different GSM carriers worldwide.