How long do you think I could keep using my iPhone 5S before apple discontinues updates and other services on it?

I think after this phone I'll go to a iPhone 6 or to a android phone that performs the same or better than the iPhone. I was really disappointed when they removed the headphone jack and drastically changed the outside design of the phone so there's no possibility of me wanting a iPhone 7 or 8. I've been using iPhones for 4 years now and using apple products for 7 years so i'll really miss the iPhone when that happens. And I've had my 5S for 2 years now

I need to switch phone carriers but my phone is tied with another company

My grandfather died a couple months ago and I got his phone. The phone is tied with Sprint and I want to change to another carrier because Sprint has no service where I live, and I don't want to have to pay for a plan that doesn't have service. The phone has been payed off, so I was wondering how switching to another company works when another company already owns this phone? Would there be a fee to untie the phone with Sprint? I've searched their website and I can't find anything about it, unless I need to contact them.

I'm having trouble figuring it out online which is why I'm asking for help here. Has anyone else gone through this? I know it's possible to switch but I'm not sure how it works. Can someone please explain to me how it works and if it's worth doing it? Any suggestions or advice would be great!

As far as I know, my grandfather didn't have a contract with Sprint. I also have an iPhone 5S.

Why is iphone randomly restarting?

So recently my iphone 7 had been randomly restarting when i'm in apps. The screen turns black, then loading circle appears and its back to normal. I have all the software updated to the most recent ios as well. So what is causing this, is it a ios bug maybe?

Why are everyone so good at photography?

I'm 15 years girl and I love photography, but when I see others, they are just so good and perfect. I actually cry some nights cause I'm so jeaulus, I'm starting seriously enjoy photography around 2 months ago and I improve really much, but I'm such a noob that I even don't have a camera just iPhone 5. I'm really worried cause I love photography so much, but some 13 yo are better than me too. Can someone tell me how can I be better and tell me honestly, how much good are my photos, HONESTLY and please if you know how to be better let me know (sorry for bad english)
Some of my best pic: https://docs.google.com/...9AebTKf6LU or you can check all my photos if you want on instagram @funnybunnyjoshie