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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.
Try the following: 1. Use another SIM card might validity of your finished 2. Clean the contact card reader phone and SIM card 3. Perhaps you should lock your phone to a specific operator so your SIM card does not recognize so you need to unlock phone
ERROR:The sim card is not valid.
1.Check the sim card with another mobile.
2.Else,the sim card is not registered(which displays the message "sim is not valid") and we have to call customer care and tell them to register your sim card.
If your phone is telling you that your Sim card is not valid.
There is two possible conditions.
1) There is water on you sim card or it is dirty
What to do: Take yout phone apart (back caver, batteries, SIM card, abd
memcard) dry everything and clean it up. Then put it back together.
2) Your sim card is scratched. To ensure it try that sim in another phone and see....
Only thing to do: Buy a new Sim card.
Hope my info solves your problem, Thanx for using fixya....