Try removing the simcard from the iphone by inserting the end of a paperclip into the small hole at the top of the i-phone, this will push out the simcard. Then clean the simcard and re-insert it into the phone, the issue should now be resolved. if it persists then it could be because you have a faulty simcard in which case take your i-phone to your nearest apple/o2 store and they should give you a replacement.
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Hello. Is you phone not accepting any GSM SIM card? Then it must be a problem with the SIM port on your mobile phone. Get it repaired form local mobile store. Is your phone accepting only a specific network's SIM card and not accepting any other network's SIM card? Then the device must be restricted with the specific network. You need to unlock it by entering the unique unlock code. You can get the unique unlock code for a mobile phone from ProUnlocking.com at affordable cost with an easy unlocking guide. Good luck.
If the Nokia X6 16GB phone,displays invalid sim card message on the screen it is locked to some network.Please find out the network and country it is locked now.If it is locked to network,it will not accept other network sim card.But you saying it is accepting other networks sim card.How many network sim card have tried inserting in it?If you tried only one network sim card and it accepted that it is locked to that network.You can also try using some other network sim card.If it displays invalid sim message again.It is under network lock.To unlock it use unlock code.Visit the site Wickedunlock.com get code and unlock it easily.
If your phone is not accepting any other sim card, then it means the phone is sim card secured lock or protected, there are some phones that do not accept any other kind of sim card apart from that which they are made for.
For instance a phone made for vodafone purposes cannot accept etisalat sim cards, it will only accept vodafone sim card. Therefore that is what you are facing with the phone.
Take not, if you insert similar kind of sim you were iniially using, it will accept it.
That is why you cannot use another kind of sim on the phone.
Thank you for using fixya
check whether that phone is a t mobile or not. mostly foreign mobiles will not accept some Sim cards.kindly format the phone with new OS this will able your phone to accept the Sim card.kindly ask the service to format the mobile. after formatting the phone will be support the Sim card..