Iphone storage problem?

I have 12GB of storage on my phone. I added up all my apps and how much storage they take up… I use 1.8 GB of storage yet it says i have 470MB available. I deleted my backup so i have 4.2GB available on icloud. My computer is connected to my phone and i have 250GB available on my computer and have 180GB left to use. Please tell me what i need to do to get fix this issue i don't know what to do

If I theoretically stole an iPhone?

And turned it off, would it be able to be tracked using the Find My iPhone app?

2. If I lost my iPhone and they turned it off, what are my options to track it down. They ve got to turn it back on some time right? Would I be able to be alerted when it is turned back on?

What are my options

Unable to text on IPhone

When I text the number 63336, my Iphone puts a space in the number, so it sends to "63 336" and it fails to send. It is impossible to remove the space. Does anyone know how to do this?

Free use of phone (iphone 6) without line using only local Wi-Fi hotspots?

So my mom gave me her iphone 6 cause she doesn't use it anymore and there's a crack on it.
the line(verizon) has been disconnected, but the phone still says verizon on the upper left screen
(i'm noob on phones)
i hear there are ways to keep using the phone as long as you have a local Wi-Fi (at home or at work) using apps? Like apps that lets you have a number that receives texts or calls too? As long as you have Wi-Fi connection.
and i'm assuming the apps will keep working even without a subscription.

also i was hoping to switch to a prepaid thing, no idea how. I'm clueless with phones.

my last phone was like 8 years ago. Where all you could do was dial numbers and send texs. No idea with these apps and stuff.

Help me with my phone problem

So my iphone 6 kept on restarting by its own. Now it doesn't turn on! I charged my phone but it still won't turn on