Best way to monitor my kids iPhone?

What's the best software or whatever to monitor my son's iPhone 5s? He also has an iPad as well. I have the unlock passwords of the devices and he's instructed not to change them. What's the most popular social app that young kids nowadays like to use?

My iPhone 5s Just Turned Off?

I had my iPhone 5s for about 5 weeks. I have ios 7.1.1, and a while ago it just shut off? It was like a 40% battery, and the phone just randomly turned off. Please help me quick i'm scared. I tried plugging it in the wall an pc but nothing. Please help me! My parents will kill me but i didn't do anything wrong to it. Please help me! Thank you

Added (1). i had it plugged in the pc for like 10 minutes and nothing happened, the phone is just super hot

Is there an app like this for band members?

I already have an app where you can edit One Direction into your iPhone pictures. Are there any apps like this, but for band members (like from Pierce the Veil, Sleeping with Sirens, Bring Me the Horizon, etc)?

How to download non-itunes songs?

I was wondering if there was a way i could download a non-itunes song onto my iPhone (specifically the super mario galaxy 1 and 2 soundtracks for free) I have a mac and an iPhone and know almost nothing about technology.

TOO MUCH AT THE END? Or did I end it on a good note?

We had our first fun conversation! I did what you said, message her the way I message you! She isn't coming to work on Wednesday cause she has a lacrosse game so this was the messages

Me: You need me to pay the sub on Wednesday?
Kate: Hi yes pelase your the best
Kate: I'll pay u on wednesday or Thursday when I get back
Me: haha no worries. How was your last lacrosse game? You do better than your first?
Kate: It was really good thanks!
Kate: umm well I didn't do much second time
Kate: Cuz it was a bad team
Kate: But we have game all day tomorrow
Me: or you were just too good and they just gave up?
Kate: Yea (my name) that's why.
Me: well do better this time! Remember to aim at the right net this time?
Kate: Haha I'm de so like I never touch the net nice try tho. (did not understand parts of that lol)
Me;: Live and learn right? Oh ya and make sure its the ball at the end of your stick, not your iphone.
Me: other than that your golden! GO EM TIGER

too much at the end?

How to convert my iphone from tmobile to at&t?

I purchased an iphone 5 from a charity org. And the phone was locked on the icloud screen. Got past that but it will not accept my sim card, it says my sim card is not supported under the activation policy. Can I take the phone to AT&T and have them convert the phone over to them?