How long will it take to flash my phone?

My dad bought me my first iPhone in feburary. A month later he took it from me saying the bill got too high so I didn't have a phone for a month! (I'm 16 and I ride buses alone so I need to be able to communicate) once again he got me a 7 plus in may then a month later he tried to take it back AGAIN but my mom stopped him. My phone is now off and I'm back in school soon.
He's saying he needs to come and "flash" it. (From T-Mobile to metro pcs) He said I won't have it for a month and I'm too scared to give it to him cause I love my phone. I plan on going with him to flash it but how long does it Really take to flash a phone so I can know and my dad won't trick me again.

How long does porting a number take?

I just ordered an iPhone SE for $129 that is locked to Total Wireless. I'm currently a T-Mobile prepaid user and I plan on switching to Total Wireless when my iPhone arrives. I want to keep my current number as it would be a hassle to give a new number out to all my contacts and luckily Total Wireless allows this.

However, I was wondering if it will take a while and I'll be without a phone during that time. Have you ever ported a number before? If so, how long did it take?

I need help finding a good speaker for my car

I drive a 2014 Volkswagen Jetta. I just want something that is bluetooth compatible with my iPhone 7 plus. Preferably something within the $250 price range, but any suggestions are welcome.

How to know if someone blocked your number? (iPhone)?

I have been try to talk to my aunt for a few weeks, and she has not been answering my text, and when I call her it rings one time then go straight to voicemail. I'm worry she blocked me. I might just be paranoid, because she has no reason to block me as were really close, but she post on facebook and still doesn't text / call me back. How do I know if she blocked me? When I text her would I get a message saying she blocked me? (sorry I don't speak fluently in English and if it is hard to understand)

IPhone 6 Plus screen not working?

I have a iPhone 6 Plus that had a cracked screen. I replaced the screen (it works on the donor phone) but still nothing will come up. The phone is working. ITunes will identify it when plugged into the computer. What else could need replacing, or be wrong to get the screen to turn on.

IPhone 6s vs LG Stylo 3?

I need a new relatively affordable phone. Anyone have either of these and can give any advice on which is better? How's the camera/responsiveness on each?