How to put new music on my iPhone?

I have the iPhone 5 with downloaded songs on it (I don't buy songs from the iTunes Store). I have all my music from my previous computer (the music that is currently on my phone) on this laptop (transferred via external hard drive from my old laptop). I recently got this new laptop and installed the the 11.0.0.163 version of iTunes. I'm constantly finding new music I want to add to my phone, so I download it and save it in a different folder on my (new) laptop. How do I, while keeping all data currently on my phone intact, add new music to my phone?

P.S. I feel like I'm leaving out a lot of important back story but my brain is just so fried from trying to figure out what to do so help would be much appreciated
P.P.S I backed up my phone to the new laptop but only my photos and videos were transferred

Can i get money for my iphone 3gs?

I have an oldish white 16GB Iphone 3gs, i have recently replaced the screen, everything works perfectly fine. It is a tiny bit scratched up on the back, but i have quite large stubby fingers and i can't use it easily, i just want to know if there's any shop in South Australia that i can get money for it, any help will be greatly appreciated. Not for store credit though, for actual money so i can buy a different phone

How to remove call barring from iPhone 4s?

I touched something wrong and all incoming calls became blocked,
any solution (with our rest) I will be thankful to the soonest reply,
thanks,

Added (1). What I'm experiencing is: any incming calls is blocked,
I Need only a feedback with solution with easy steps to follow and solv the problem,
Definitely do not need someone to analyse and guess and finally no provide any answer,

Added (2). What I'm experiencing is: any incming calls is blocked,
I Need only a feedback with solution with easy steps to follow and solv the problem,
Definitely do not need someone to analyse and guess and finally no provide any answer

Best free unpopular apps? For iPhone?

I've had the iPhone 5 for a while now and it's getting boring so what are some good apps besides the obvious (ex Facebook ig tumblr temple run) what are some fun unpopular games or any app (free!)

Why isn't my iphone 3GS activating?

Ok, so my iPhone 3GS was unlocked on 5.1.1, and it was jailbroken. I wanted to factory unlock it, so it will be 6.0.1 and still unlock. When the people said my unlock was ready, they told me to update it to 6.0.1. When I tried setting it up and activate it, it won't work. It says we're unable to continue with your activation at this time. Any help would be appreciated.

I downloaded a minecraft pe map?

I went to a website and downloaded a map for minecraft pe. It redirected me to a file Sharing website called 4 shared. Is the map I downloaded ilegal? I have no idea who the creator is. By the way is iPhone explorer suposed to cost money because the one I download was free. Please try to awnser correctly try not to be silly. Thank you. By the way the map is filled with fancy materials and buildings, the place is spotless. Please answer me.