This solution also shows the SIM filter IC's solder ball bumps connection which can be used as a guide for easy line paths tracing procedures.
Nokia 1280 Insert SIM Card Solution
Nokia 1280 SIM Filter IC Jumper Ways
By replacing the SIM filter IC can only solve the insert sim card problem on nokia 1280. However, if you are having trouble in finding the replacement of this component, you may just apply a solder jumper on it exactly as the same as how it showed on the solution above.