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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 Nokia X6 16 GB Displays invalid sim card while inserting other Network GSM sim card like MTN ? It is locked to network.You need to specify which country and network it is locked now.I have bought an Nokia X6 16GB in INDIA but it was locked to Australia Vodafone network .I have unlocked it and now using it in USA AT&T network sim card.So you can unlock your Nokia X6 16GB from current network lock using the unlock code from the site Onlinegsmunlock.com after unlock it use with MTN network sim card or any GSM pay as you go sim card it will not display invalid sim card message.
switch off your blackberry, remove the back cover and battery, and remove the sim card. Replace it after about one minute and it should not read SOS anymore. If it still reads SOS, insert your sim card into another cellphone to see if it also reads SOS in a different phone. If it does, you need to call the company you bought the sim card from. Eg; if it's an MTN sim card, call MTN; if it's Vodacom, call Vodacom etc.
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..
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