Can a magnetic flip case damage my iphone?

So I bought a swisstech magnetic flip case and when I was using it for like about 10 mins my phone started heating up. Like really hot. So IIm concerned if a magnetic flip case damages an iphone.

Glass screen protectors for iPhone 6 keep braking?

So I keep buying these glass screen protectors of my phone and they keep cracking! This is the 5th one I've bought and it just cracks over nothing! Havnt dropped it, haven't been rough with it, havnt tamperd with it. I got this one about a week ago, dose anyone think I can get a refund? Like there about 150$ here in Canada!

Problems with IPhone 5c screen?

It's been glitchy every since I bought it a month ago, and the screen has these lines going across the lower half of the screen. I have a family member that s happening to them to. I just updated it with the recent update, but it went right back. How can I fix this. I've turned off the phone, and restarted it but the same thing.

Getting an iPhone 5 soon, but it's an import. What will I need to do with it?

I'm going on a trip to the United Kingdom soon to see my sister, who has offered to give me her old iPhone 5 to take back with me to the United States. I accepted the offer, but I want to know for sure if it'll work on the AT&T network. I believe the iPhone 5 that's waiting for me was originally on the O2-UK network, and that all of the UK's mobile networks are GSM. AT&T is a GSM network, so I can only assume that taking my AT&T SIM card and putting it in the UK bought iPhone 5 shouldn't be a problem, but is that true? And what else would I need to do? Do I have to contact O2 and/or AT&T? Does the device need to go through Customs for either country? Will I need to have it unlocked? Will it work with AT&T's LTE band? Will I ever stop asking all these questions about it? Okay, that's probably a "yes" on that last question, but I still want answers to my other questions. Any true help is much appreciated.