Why did all my contacts just disappear from my iPhone?

I don’t have any other device or program or whatever, I haven’t synced my phone to a computer or anything. I just have the iPhone, and today all my contacts just suddenly disappeared. The phone is in my company’s name so I’m not sure if AT&T will talk to me if I call to ask about it.
I have yahoo set up on my phone, but do not have any contacts set up in it, so I haven’t deleted any from there. But good to know to watch out for that in the future!

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