My 1600 is insert sim card problemi changed the charger connector.but no resp
1st, try to clean pin of simcard, you cau use eraser, or maybe simcard ic problem. If you set drop it before, by using soldering iron, Solder with a lot at the end of the soldering iron tip, place on the surface of the ic, the process must be done carefully. never press the soldering tip, leave a lot of Solder is the press. but remember, you need to apply some sim Solder flux in the IC. If the problem is still not finished, then you need to change sim ic new.