Is it my phone or instagram?

So i have and iphone 6 and for some reason on my instagram the number of people i'm following drops but when i go to see who blocked me it turns out it was no one and everyone i ever followed is there. So is it instagram or my phone thats the reason behind it

IPhone 6s system taking up too much storage?

I have an iPhone 6s. Had it about a year. Recently I ran out of storage, I checked my settings and it says the "system" is taking up most of it. I read some articles that said to update it to newest update, factory reset it(as a new phone), and I've done everything. Right after I factory reset it, I checked the storage and nothing changed with the system. Can anyone help? It's taking up 5.43 GB out of 16 GB. I really want to keep my current phone!

How can I get my phone back, please help? ITS BEEN A MONTH?

I got my phone taken up because I begged my mom to go to my boyfriends house but she said so so i begged some more and she got mad and said no. So i didn't go.
When she came home from work she talked to me about how disrespectful I'm and how she doesn't want me going.
Then she took my phone and read all my messeges including the ones with my boyfriend and at one point he said "UGH I'm gonna kill someone" as an expression and she got super mad at that. Then I deleted everything off my phone from find my iPhone and she got even more mad. I wrote her a super long letter telling her i'm sorry and how ill change and i've apologized to her in person.
I'm in highschool and I really need my phone for extracurricular activities after school and in most of my classes. I've been struggling recently without my phone and I really need it but she doesn't seem to understand. Please help.
I'm generally a good kid. I make high A's. And i try not to make my mom mad but sh always ends up frustrated at me so we argue often. But this time she really blew up.

Can Bluetooth 4.2 connect to Bluetooth 5.0?

I'm planning to buy the next generation of Apple Watch when it's released (September), because it's most likely going to come with Bluetooth 5.0. However I have an iPhone 7 Plus right now which has Bluetooth 4.2 . So will I still be able to pair up the devices?

Will resetting iPhone from Settings menu clear the viruses?

I bought an iPhone second-hand. The previous owner claimed that it had a "virus". I know a virus on an iPhone is very unlikely, but considering I'm planning on using this iPhone to check my bank account, I want to make sure there are no viruses. I have Linux, and iTunes is not available for Linux, so I can't restore with iTunes. Would going to Settings and resetting it get rid of this "virus"?