This would fall under the heading of evesdropping, which is frowned upon but not actually a crime. The more serious question is, what is this person doing with your phone in the first place? Theft of a phone is a crime. But maybe you just leave it lying around. Keep closer track of your phone.
No.
Yes
no...but its rude to look without asking him..
Yes. It doesn't matter if you make money off of it or not. If you use someone else's music without their permission it is ILLEGAL.
Yes, it is illegal to tow someone else's car without their permission.
You can't. And shouldn't.
It is generally not illegal to take screenshots without permission, but sharing or using those screenshots without permission may violate privacy or copyright laws.
Not if you have their permission, or the permission of their guardian if they are under age. If you are going to go into the business of cutting hair, it is probably illegal without a license.
Yes, it is illegal to send unsolicited emails without permission, as it violates anti-spam laws.
Downloading copyrighted material without permission is illegal and constitutes copyright infringement.
No, it is illegal for someone to enter your property without permission.
Yes, it is illegal to enter someone's house without permission. This is considered trespassing and is a violation of the law.