Lost contacts and certain data after phone died

[AC Question]

So i left my phone in my car.. it was cold out ( -10c) It died....Then when i got it back to my house. I plugged it in to charge... It started up in the screen where it optimizes app X of XXX... It has done this before, and it goes through all of my apps.. This time it only went through 7 apps. All of my contacts were gone, saved passwords such as facebook, snapchat, instagram etc. were gone... Then half of my contacts magically appeared...

When i turn off my phone and turn it back on.. The HTC startup gingle doesnt even play.

any ideas what is going on?????

 

[B. Diddy]

Welcome to Android Central! Phones do not do well in very cold or very hot weather. -10C is 14F, which is the exact temp that the iPhone failed in the study mentioned here: Sub-Zero Weather: Can Your Smartphone Stand The Cold? | PCWorld

Are you saying the phone won't turn on any more? You might have to wait a little while for the hardware to recover from the temperature insult (if it will recover at all).