IPhone 4 deleting my contacts by itself?

My iphone 4 is about a year old and recently it is deleting my contacts by itself. My phone says it has no contacts and names on texts have been change to numbers. It's done it twice in the past 5 days. What's going on?
Is it my phone or the sim card?

Maybe the memory is filled up get a memory card (or that is filled up)!
:)

Never heard of that happening. Make sure you backup your contacts to icloud, then you can easily just add them back if that happens, are you running some type of app related to that?

My has been doing it for a month now. Along with several other people I know

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