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Hi is your Nokia 6070 mobile is displaying Sim not valid message when you insert your sim card then it mean your phone is locked to some other network due to this when you insert other network sim it will display messages like "Sim not valid" ,"sim unlock code " ,"NCK code " and so on ...To fix this you have to unlock your phone from that network provider ..You can easily unlock your phone using sites like MobileUnlockSolutions.com here they are rendering unlock code for all mobile models at reliable cost ...After unlocking your phone you can freely use it with any GSM sim ...
If your Nokia C7 phone displays an error message saying "Insert Sim (or) Sim card not valid" then your phone is probably network locked. To unlock it,visit the site OnlineGSMunlock.com here they are providing the unlock code at reasonable cost with easy step by step unlocking instructions and unlock it.Then you can use freely any GSM network Sim card.
If your Nokia 6681 displays Invalid Sim ,it may locked to some network,You need to unlock it to use other GSM Network sim card....Visit the site Mobile-unlocker.com/nokia-6681/rs2wp9/ get the unlock code at reasonable cost and unlock it easily.Then use any gsm network sim card.
This error usually occurs when you attempt to use a SIM card from a network other than the network from which the phone originated (e.g. your Nokia mobile phone originated from Orange UK and displays the 'Sim Card Not Valid' error when you attempt to use a T-Mobile UK SIM card). The 'Sim Card Not Valid' error usually means the phone has been restricted for use on one specific network and you would need to unlock the phone before alternative network SIM cards can be used.
could You test the new SIM on another phone? Could be the housing of SIM damage on phone - hardware problem - Nokia Service.
in any case you need to find out which network and ask them for the unlock code.
Only the original network to which it is locked can provide this code.
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.
Hi if it says that then the chances are that the simcard is blocked or not accepted on that phone so either try another sim card in the phone and also do you know what network the phone is on cus if you put different netwrok in it wont recognise the simcard