if nokia 101 insert sim 1 is not working then it can be fault of missing tracks and path. Parts can be damage due to water damage and rust so after dis assemble of mobile phone make it clean with electronics cleaner and apply hot air to make it dry.Nokia C2-03 Camera Standby Notworkin Problem Solution Jumper Ways
In above diagram you can see different color lines that are used in sim
functions. Check these tracks with meter and if any of them is missing
apply these jumpers to solve insert sim problem in nokia 101.