My IPhone 3GS keeps deleting my contacts?

I have an iPhone 3GS for about a few years now and lately it seems that whenever I turn it off and then when I turn it back on, my contacts disappear. The numbers and texts will still be there but the names that I save the numbers as disappears. Why is this happening? What can I do to fix this?

In your case you had it a few years, why not just get a free upgarde and go to 4 which is free with a 2 year contract?

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