How to format

Hello,
I have a 2 gb kingston micro sd card. When i put it in my nokia 3110 classic phone , it can recognise the card but on opening it says that the card is not formatted and then it says that the operation failed. When i put in my mp3 player , it does not even recognise it. I think it is corrupted. How can i repair it? I am out of warranty period. Please help.