How to remove preinstalled Iphone apps?

How to remove preinstalled Iphone apps? - 1

Added (1). I've been trying to sync some more music to my phone lately, but my storage is too full to do so. I actually don't have that many apps- not ones that I chose to install, however- the problem is all of these pointless apps my phone keeps installing with every single update. About 75% of them I have never had to open once. I just want to clear up some space so I can put the rest of my music on there (I don't have that much to begin with)
Is there any way I could get rid of them?

How to stop messages on an IPhone 5s to sync to another device?

My mom updated her phone today, and ever since all my messages on imessage have synced to her. We have the same account. And its only my friends messages being sent to her. But id like my privacy and so does she and we need to know how to make sure both of our conversations arent seen AT All and that if we were to figure out a way. We can still get notifications on our device alone. I found a way by turning imessage off but i hear that it will cost extra since its not on the data plan and since i've turned it off i haven't been able to get a single vibration or notification that i've had one. So i need help.

Are all ads for free iPhones and stuff lies?

Ok so almost everytime I go on the Internet and boom! This add pops up displaying a free iPhone or tablet, etc. But i don't know I get it on so many sites. Do you think some are real ads or scams?