You could try cleaning the contacts on your sim card using an eraser and see if that helps.. If it is still not working try using your sim in another phone, if your sim is working 100% in other phone then it is either the imei of the phone is corrupted or the phone is block by the provider!!!
SOURCE: Sim registration failed
most of this nokia phone(the old ones) do often experience such problem due to it's constant falling on the ground.
in such cases after restarting the phone the problem should be corrected for a while...............using a NEW sim card and practically the one of a network with the strongest signal does in most cases rectifies the problem a bit.
all the same i would ask you to send it to a phone technician for more help.
good luck
SOURCE: Nokia 6300 programs download
try to update the software used in it by contacting the nokia care
SOURCE: Nokia 6500 slide sim card registration problemit
Hello
There are two things causing this problem,either your phone is not registered to the Sim card's network or your Sim card is corrupt
To find out where the problem has come from,you should try another Sim with your phone, if the Sim does not work then the phone is registered to a particular network and no other Sim card will work on it.
If you try another Sim card and it works then your Sim card is corrupt and you should replace it.but to be double sure,test the Sim card on another phone to see if it works,if it does then your phone is not compatible with the Sim card's network but if it does not work then your Sim has to be changed
thank you for visiting fixya
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