I want to jailbreak my iPhone, should I?

I have an iPhone 6s and I don't know if I should jailbreak it. I want to but I don't want anything bad to happen. I know what to do when the iPhone 7 comes out. I have this iPhone forever thing where as long as I don't crack my phone, I can get the next iPhone for free. I backup my phone and use the backup before I give my phone to them to "unjailbreak" it. Or I update it if an update becomes available. But before I consider jailbreaking my phone, I want to know more about the security issues. I'm running iOS 9.2.1 and I want to know what security issues could occur if I jailbreak it. Also, if there are any providers that possibly make jailbreaks that has good security if they even make those.

How to get my iPhone 6 replaced by Apple for free under warranty still?

How to get my iPhone 6 replaced by Apple for free under warranty still?

Added (1). My iPhone 6 still has warranty till August and I really wanted to go in and get it replaced due to multiple reasons, can you guys tell me about your experiences with these issues and how your warranty worked:
my iphone 6 is a little bent on the top
battery sucks now
sometimes speakers work, sometimes they don't
the touch doesn't respond all the time
anyone know other reasons why they would completely replace my iphone?

Why do I complain so much when I have more then others?

My parents buy me thinhs and I'm never happy. Like they could buy me an iPhone, and after a little ill just be satisfied. Not that they buy me things like that but I mean my mom took me out to get new bra and underwear, and then took me to get some clothes took me out to lunch, bought me foundation in this past week and I'm not happy anymore. When I was a kid I was spoiled, then teenager we were poor living in a camper for 3 years in my granas backyard and now we have money again so I know what its like to not have anything but how can I be more humble? Like I just complain about everything, and my little brother is starting to copy what I say now, like he's starting to complain and always say "I'm bored" and I never realized how much I really complain til he started picking up on me and he gets everything he wants and I feel awful because now he's gonna never be happy with what he has and always think that if he had better or more he would be happy.

Can I call the police because of a prank call?

Someone keeps calling me and calling me and on my phone it doesn't give me the option to decline so i pick up and where i live its extremely late at night and they ve called about a dozen times and i'm not over reacting. Would it be a decision to call the police after I've
a) hungup everytime
b)told them to stop calling everytime
c)threatened to call the police

I need the original prices to the iPhone that have been on the market?

I'm doing research on iPhones and I need the starting prices of each of the iPhones, including the different GB models of each phone.
iPhone 2g iPhone 3g iPhone 3gs iPhone 4 iPhone 4s iPhone 5 iPhone 5c iPhone 5s iPhone 6 iPhone 6s iPhone 6s plus and the iPhone 7 if the prices and GB models are available.