Often we meet several mobile phones after a fall or hit the water or suddenly appear on its own message "Insert Simcard" because ic regulator that supports simcard problem, then the defense:
Example: Nokia 1600
1. Rehot (Heat) using a blower.
2. Replace (replace) the new.
3. Where do the trick did not find a replacement jumper (pictured below)
4. If the steps above still does not work, check once again made possible the installation or still less precise jumpernya
5. When you are sure the installation of ic or jumpernya are correct, it still does not work also enabled power ic (UEM) with problems.