1600 insert sim problem tips tricks

Try with another sim card, clean the sim connector of your phone, reset you phone to Factory Setting (default) using 12345. If you can open it, clean the mobile thoroughly using iPhone solution. This problem is caused by Firmware problem and Hardware problem as well.
OR:
New Software Reinstall in the Phone

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.

Before you do anything with it, please clean the sim card and sim card connector on the handset. Even a small rust/dust can create this problem.

If it doesn't help, you need to check the Sim card on another Handset. In most cases, this is damaged sim connector, and will be necessary to replace or re-soldered/refreshed. Sometimes even sim IC is the culprit which you need to replace or play jumper tricks. I would suggest you to get it done from a service center or from a nokia mobile repairing center.

Good luck.

Thanks for using FixYa.

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.

This problem is called the 'insert sim' problem, there are several possibilities but first of all clean the sim card and the sim card interface on your phone. Next try it with another sim card. If this doesn't solve the problem, you need to go to the mobile repairing shop to get it serviced, or if you have idea in repairing mobile you can refer to this site on how to do jumper tips and tricks for this problem..http://sephonetechnology.blogspot.com/2009/08/nokia-n70-sim-ic-jumper.html Good luck.. and please...-:)

Never touch the connections on the SIM card or the phone. Clean the connections gently using surgical spirits. That should do the trick.
On rare occasions the SIM card needs replacing, your network service provider can give you a new one, sometimes it's free.

INSERT SIM

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Either your sim card is not seated correctly, the contacts are dirty, the sim card is dead, the copper contacts in the phone do not reach the sim card or the electronics in the phone are faulty. try to change a new battery' or maybe the sim card driver is unsoldered' or need to replace. here is the pics. skilled technician can do.