i just recieved a phone that i bought on ebay. its a sony ericsson t630. i also have a sim card that i have not used for about 1 1/2 years. its from russia, i lived there before. everytime i insert the sim card it says "please insert the correct sim card" why is it not working with my sim card. could it be because the sim card is old. is this phone not unlocked, if so how to unlock it?

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