How to unlock my HTC phone when network locked after changing SIM?

my doughter presented a htc phone to me at I return to india and changed an indian airtel simcard in to the mobile.. at once it network getting to un lock it ..please help me in any way... 

Hi there. Check local cell shops if they can unlock your phone, else you will have to contact the carrier it is locked with and purchase an unlocking code.

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