No
You're not in prison when you join the military. However you'll only be allowed to contact outsiders when you are off duty during bootcamp. It appears that no electronic devices are allowed at bootcamp so you'll have to use a public phone.
You are allowed to travel with one cellphone.
Presidents were not allowed to use a cellphone until President Obama took office. He is the first President to keep and use his smartphone.
Why should cellphones be allowed in school and in the classroom? I actually meant (facts).
Get an iTouch, or convince your parents to let you have a phone.
"BYF" is an abbreviation for "Bring Your Friends."
Yes. Don't expect to have any reception though.
Yes, you are allowed to bring in posters to Nassau Colosseum.
Yes, you are allowed to bring adapters on a plane in your carry-on luggage.
Yes, you are allowed to bring an umbrella on a plane in your carry-on luggage.
Yes, you are allowed to bring umbrellas on a plane in your carry-on luggage.
Yes, you are allowed to bring wipes on a plane in your carry-on luggage.