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Hi is your Nokia 6700 slide mobile is displaying sim not valid message once you insert your sim in it then it mean the phone is locked to some other network provider due to this it wont any other GSM sim until you unlock it .You can easily unlock the phone through online providers like MobileUnlockSolutions.com here they are rendering network unlock code for all mobile models at reliable cost .You first check that whether the code is available for your country and network provider .If yes then pay for it and unlock your phone then freely use it with any GSM sim ...
hi there are many ways to unlock the mobile we can use software,program ,codes etc to unlock .among them codes helps a lot.to get the codes visit here unlocking4free here they ask the following details the country from where you brought the mobile the provider to which your mobile is locked imei number of the mobile finally they will provide you the unlock codes at free of cost.
hi you can use codes to unlock your mobile this mainly save your time and money a lot you can visit here http://www.unlocking4free.com/nokia
to get the codes to unlock your mobile they provide codes at free of cost.
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.
Ask in the forums in moneysavingexpert.co. There are a few techies there who will give you the details. You will need to tell them your make model and IMEI number. They will tell you if it cannot be unlocked this way-they do not charge-I had my nokias unlocked via them!
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