A lot of my contacts have disappeared from my phone in the last few days. I've called some of them just few days ago and when I try to call now they are just not there and there is no trace of them whatsoever. If I enter them again as new contact, they show back in the call history as if they've always have been there. In some cases the name of the contact and email is there, but the phone number or one of their numbers are missing. In other all the information is just gone. And no, I have not deleted anything from my phone. Does anyone have any idea why this might be happening?