''Please insert SIM card''

Hi,

Just put your sim card on another phone set to make it sure whether your SIM card is working properly or not. If yes, then do a factor default after saving your necessary data please.

I'm not sure what the question is you are asking concerning a "sim card" but if it's How to put a SIM card in your cell phone you need a pin to put in the hole and it will pop open, However if your question is that your phone keeps telling you to insert a SIM card then you need to turn off your phone first and then go into the place where it's at and remove the SIM card and then put it back in and then turn your phone back on.

Hi,
Your phone may be locked to its Network, that's why it shows "sim card not valid". In order to use other Networks, you need to unlock your phone. You can unlock your Nokia N70 using code.You can either get the unlock code from your service provider or from reliable online site. Superunlockcodes.com is where i unlocked my phone, they offered codes at affordable price, with simple unlocking instructions.

Hi,
Please check the SIM card if it is correctly inserted or if you put in the SIM card the wrong way. But if you put in the SIM card correctly, you need to check your mobile phone if it is open to the network of the SIM card. If your mobile phone is unlock for all networks available in your country there is a problem on the SIM card. Please contact the network provider.
I hope I answered your question.
Thanks a lot!

Try power cycling for the phone. Please follow the steps below:

1. Remove the battery from the phone while it's turned ON.
2. Remove the SIM card.
3. Leave the battery and the SIM card out for five (5) minutes.
4. Put the battery and the SIM back and turn the phone ON.

If same problem occurs, try using another SIM to isolate the problem. If same thing happen after trying another SIM, then the phone needs repair. You may need to contact the manufacturer.

Have a great day!

This happened to me too. A temporary fix is turn off your phone and put it in front of a really cold air conditioner for about ten minutes. Then turn it on but make sure you keep it in front of the ac to keep it working. What happened is your sim card reader has a thermal problem so you will need to take it in unless you want to spend all your time in front of the ac (which will get expensive...)

try to reformat the sim before inserting it in phone. also make shure to not exceed sim memory size or speed.

THIS PHONE DOESN'T USE A SIM CARD.....DUHHHHHHHHHHHHH!!

Please follow the instructions carefully! Following are the 12-point instructions to unlock your Samsung E250 phone:
1. First do a CUSTOM RESET by tying in:
*2767*2878#
(Phone may display foreign language – don't worry! The last digits after the * will appear as - - - -; this is normal)
2. Turn off your phone
3. Take the battery and SIM out of the phone
4. Take a wrong network SIM (a SIM the phone does not currently accept) and insert it ONLY HALF way in, so when you turn on the phone it won't detect the SIM. Very important so the phone won't ask for network password and will show "Insert SIM" message.
The process of inserting only half of the SIM. I advice you to take care and do it with a soft approach as you might not have done this before.

5. 2. Now put the battery in carfully behind the protruding SIM card and switch the phone on. The phone must show "Insert SIM" message.
6. 3. Without turning off the phone, now push the SIM card all the way in, at this stage the phone must continue to display the "Insert SIM" message with the WRONG SIM inside.
7. Now make a FULL RESET by typing: *2767*3855#

9. Change the NCK password to 8 zeros by typing: *7465625*638*00000000*00000000#
8. The phone should reboot working with "wrong" SIM inside. (Do not turn off the phone)
10. Disable network lock by typing: #7465625*638*00000000#
12. Check this is done with *#7465625#
If your phone is not unlocked please retry the above ensuring all steps are followed to the letter, 9 out of 10 people who have problems have made a simple error and find that when they repeat all the steps it works.

Your card might be a little dirty and needs cleaning in the metallic parts where it connects to your phone. If your card is too old it might need to be replaced by your phone company. Try and insert another SIM from a friend and see if it works. Also please try to insert YOUR SIM in another phone and see if it is OK. If it works in another phone then the problem might be with your phone's connectors.