A Nokia C3-01 mobile which wasn’t recognising it’s SIM card.

I don’t normally work on mobile phones because I don’t have the full range of specialist tools needed to deal with surface-mount components, however this job looked quite straightforward.

Cause of the problem is some broken spring contacts where the SIM goes in.

This close-up photo shows that the top contact is cracked at it’s base and will soon break completely, the second one down is snapped but feels firm enough to work with, while the lower tab is OK as it is.

The solution was to make and fit new contacts. Phone was re-assembled and tested OK

It took a few attempts before the top contact would ‘spring’ properly, but then I am using pieces of wire to make the reapair. A professional phone-repair shop will use genuine replacement parts, or most probably sell you a new phone