Why won't my KitSound Arena headphones connect to my iPhone 7?

I got a pair of KitSound Arena wireless headphones for my birthday last year. They connected right away to my previous phone, an iPhone 5S, and also still work great in my iPad. But ever since upgrading my phone, when I search for it on Bluetooth, it isn't even discoverable. I would love to be able to connect them to my new one, especially since this phone doesn't have an audio jack so wireless come in handy for a person who always forgets to bring the adapter with me everywhere! Does anyone know why? Or what I could do?

Instagram direct message not working?

Whenever I try to sent a direct message in the Instagram app, I get a pop up that says "Couldn't create thread. We're sorry, but something went wrong. Please try again." I'm really frustrated, because I have an account in which I need to message people on. I'm using an Iphone 6 for the app. Also, this message will persist for hours, and then it will go away and I will be able to send a few messages, but then it pops up again.

Should I spend 200$ on a phone if I'm trying to move?

I know this might seem like a ridiculous question, but I have an iPhone 5. I have a free upgrade in Dec. I feel very behind in technology, but I'm trying to move and save up (i'm unemployed). I only have about 1800 and it would cost me 200$ for an iPhone 6 on craigslist. Worth the investment or should I wait?

Emails are not showing up in mail app on iPhone 6s?

My emails in my inbox randomly disappeared and now no emails show up at all in my inbox. The junk folder and trash work just fine though. Just nothing shows up in my inbox. It's just on my phone too. I have tried removing my email account, restarting my phone, and resetting my network settings. Nothing has worked.

Why has my phone been freezing?

For about the third time this week my phone froze for 1-2 minutes. It's an iPhone
The screen stays on one page and Won't move or turn off, or change to the home screen when I press the circle button. Then a minute later it turned white with the black Apple sign in the middle and turned back on
Another time it went black while I was playing a video, and the sound was still playing

IPhone 6s Plus repaired screen?

So I had my phone ran over the other day I got it fixed some how only the screen was cracked. I got a new screen and it's been working but sometimes the screen won't let me click on anything til I lock it with the power button and unlock it. But then it will do it again. This happens like 10 times a day or more. What's wrong with it? It also had a hard screen protector. Any one else ever had this problem?