A message pops up saying: Invalid or missing sim card. You can still make emergency calls if your service provider supposrts it. I have a sim card in their but i guess it doesn't read it?? HELP ME PL

This is a normal behavior when a phone does not have a valid/working SIM card. Without a valid/working SIM card or even without a SIM card, the phone can still be used for emergency call.

I hope it helps.

Hi if your Nokia lumia 520 mobile is displaying sim invalid message once you insert your sim in it then it mean your phone is locked to some other network provider due to this it wont accept any other GSM sim until you unlock it ....You can easily unlock your phone using sites like Unlock-Zone.com here they are rendering network unlock code for all mobile models at reliable cost ...After purchasing the code visit sites like MobileUnlockGuide.com to get free instruction about how to use that code and unlock your phone .After unlocking your phone you can freely use it with any GSM sim ...

Your cell phone may be locked to a particular cell phoneprovider and in this case it needs to be unlocked to use with a different cellphone service provider.To get the security code/restriction code to unlock the cellphone from the current cell phone provider so you can use the SIM card with adifferent phone provider, Please click on this link and follow my instructions:-http://www.fixya.com/support/r4049238-unlock_cell_phoneIf yourphone provider does not help you then these WEB sites it provides securitycodes for a small price.http://www.mobileunlockstore.com/?gclid=CKDb2_y2558CFSlJagodxBkDHwhttp://www.mobileunlocksolutions.com/

A PUK blocked message pops up after one enters the wrong PUK code 7 or 10 times in a row, depending on the service provider. A PUK code is required only after one blocks the SIM PIN code.

Many times, it may so happen that you block your PIN code. You will need to call the customer care of the service provider of your cell phone for the PUK code or refer the SIM certificates for the PUK code. If you enter the wrong PUK code 7 to 10 times in succession, it will lead to PUK blocked. After entering the wrong PUK code 10 times in a row, the SIM card becomes permanently invalid or locked. The only solution is to purchase a new SIM card.

PUK blocked requires you to get a new SIM card. It does not matter whether you use a Nokia Cell Phone, LG Cellphone, Motorola Cell Phone, Samsung or Sony Ericsson handset. The handset is not the one that's deactivated, but its the SIM card that gets blocked. So, contact your network store for further help and getting yourself a new SIM card (new phone number). I hope this article on PUK blocked on cell phone has helped you find the solution to your phone problems.

The Motorola Cliq Mobile locked to some Network,You need to Unlock it from the Network Lock,then Only You can use the Other Network Sim Card,You can get the Unlock code at reliable cost at here
http://www.superunlockcodes.com/motorola-cliq/rs12wp9/ and Unlock it.
Note:Emergency call only,SIM error,Invalid Sim..these are network lock messages...

Your sim card did not register will your service provider.
Call your service provider for assistance

Invalid SIM and Unregistered SIM are two different problems. Invalid SIM means the phone is locked to a certain company and you are trying to use a SIM card for another company. Unregistered SIM means the SIM card you are using is not active and you need to contact your service provider to get it activated. In order to unlock the phone so you can use anyone's SIM, you must contact the provider that the phone is locked to.

how setting invalid sim ? cell phone setting or software plz ask me reason

These instructions worked great, thanks