My tmobile blackberry pearl flip says invalid sim card almost everyday?

J

Jason

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and when i take out the battery and put it back in it works again.any ideas why this is happening.
 
If the Blackberry Phone says Invalid Sim card means it locked to network.You have to Unlock it.Get the Unlock code from the site Theunlockspot.com and unlock it .Then use any GSM Network Sim card in it.After Unlocking it will work with any GSM Network Sim card.
 
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