How to Get rid of "No service" Message on mt6515(6820) Model AX- L3-NOTE topic

Whenever i put a new sim card the phone doesnot connects to the service provider and says no service. I m from india.
And sometimes it works and most of the time it doesn't .
Help needed
this is the link to the Mobile i am talking about
AXCELLE-L3-NOTE-Cortex-A5-Processor

AX- L3-NOTE
Product Dimension

- 145X73.8X9.0MM
CPU

- MT6515(6820) -

- 1.0GHz