IPhone power bank left in a cold room (minus 1ish)?

Hi, I have an Iphone power-bank which I use to top up the battery of my phone when I'm out.

The other day I left it in a room in my house and went out. When I came home I felt it and it was really cold the touch.

Can these things leak liquid?

I was told leaving it in the cold could make it leak? Its not leaking but I want to be careful

I think its ion lithium?

I have an iphone 8 i think the cameras broke?

I had the phone for like 3 months and now when i opened the camera there's a type of distortion on it as like the camera is shattered. Tho i looked at it and it looks all fine from the exterior. I don't think i dropped my phone at all recentley

How to backup iPhone using iTunes?

I have a macbook pro and i want to backup my iPhone's data onto my laptop (including contacts, apps, photos, etc…) and transfer it to my new iPhone. What are the steps to do it? Please list it down, will help a lot!

How do I find out someone's text history?

My girlfriend has an iphone 7 for T-Mobile. Every thing is in my name. I want to know if there's a way I can view her text history without her knowing. Any ideas?

Can i use a iphone 5s without a sim card?

I never had a iphone before and i need some help i'm buying a used iphone online so how would this work? The description says that the phone has been factory reset and the icloud account has been removed and that the company is at&t / cricket. So can i use it without a sim if not how would i go about using it? I'm currently with cricket.