IPhone 6 dies after only using for one hour?

This has been happening for a while and I literally have no idea how to fix it. I looked it up online, tried changing a few minor settings that are said to help the battery from draining so fast but literally nothing is working, tried restarting my phone, etc. It just dies unbelievably quickly, which I can't have because what if I'm somewhere without a charger and need to use my phone and it's dead? Anyways, I have no idea what to do or what the problem is. It just started doing this about a month ago randomly. Has anyone else experienced this? Advice on how to fix this problem? Any help is appreciated.

Is my husband manipulative?

I woke up this morning to find my iPhone charging without its mophie case. I looked around the house and couldn t find it. I called my husband at work and he said he took it and is going to sell it on Craigslist. He said I don't use it properly and don't always charge my phone in a timely manner. He bought me my phone and the mophie, so he feels if he buys me something he has some type of lordship over that item. Another time he asked for money that he had given me back because I used some to buy a bottle of shampoo. According to him I wasn't using it as he intended. What do you all think?

Instagram photo blurry/pixelated?

I have 2 instagram accounts that I'm signed into on my iphone 6s. When I post a photo from my camera roll to one of them, it uploads blurry and terrible quality to my profile. When I tried the exact same photo on my 2nd account it uploaded perfectly. I have deleted and reinstalled the app, resized the photo, signed in/out, restarted my phone, etc. I deleted the photo and tried uploading it again many times and it didn't help but every time I tested it on my 2nd account it uploaded fine.

Can I set up an iphone with a sim of a network, then put a sim of a different network in it?

I have been using an iphone 5 for the last little while and I just got the iphone SE. The only problem is my sim I ordered with the SE has not arrived (it's with a different network). I was wondering if I could set up the phone with the older sim and once my new sim arrives put that in it.
The iPhone SE is completely unlocked and I was just wondering if I put the first sim in if it would lock to that network.

Should I upgrade to the iPhone 6s plus or iPhone 7?

I'm almost finished my two year contract for my iPhone 6 and will upgrade next month but i can't decide if i should go for the 6s plus or the 7. The 6s plus seems a little big for me but everyone says you get used to it really quickly and it looks like the performance of the 7 isn't that different. The battery life and the fact that there's a HEADPHONE JACK (still so mad about the 7 not having one.) is a big plus for the 6s plus. But I'm worried that it won't perform that well in two years time. I really am not sure which to go with any opinions would be really helpful.