To fix this problem you may consider this procedures below:
First check and try to restore and update the device firmware.
Clean and check the Sim card pin connectors for possible damaged and oxidization build ups
nokia asha 302 ways sim / insert sim
check vsim voltage on C2750
rehot power ic (if necessary replace) N2200
See the image below:.
Note: Every diagram we post on mobilerdx.com is tested by one or more members of our team. Still Use them at Your Own Risk we are not responsible if these solutions may cause any harm to your phone.