Contact service means your mobile is locked with some network , so when you on the mobile it displays as contact service ,so for this problem you have to unlock your mobile, if you unlock means after that you can use any network at any where in the world.......
Get the unlock code for your Nokia 6300 model mobile through this site
Theunlockarena.com , it has the best instructions and easy methods for getting the code for your mobile from the network lock......
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