New Itunes transered to iphone usign a computer?

So I had an ITunes account on my computer when I was younger, but then got a laptop and switched my iTunes account over to that. My laptop unfortunately just crashed and now I need to go back to my other computer for iTunes. The only problem is that not all the songs on my phone are downloaded on the computer's iTunes. I have songs from the iTunes library on my computer that I would like to transfer over to my phone but not all the songs from that library. Also I do not want to lose the songs that are on my phone.

How much would it cost to upgrade my iPhone 5 to an iPhone 5S?

I'm able to upgrade now that my contract thing is up, and I'd like to upgrade my iPhone 5 to an iPhone 5S.

I could get a two year contract but seeing that I'm able to upgrade now it seems stupid to just buy an iPhone if it costs less to just upgrade it.

How much would it cost to upgrade my iPhone 5 to the iPhone 5S?

How to completely reset an iphone 4?

A friend of mines gave me his iphone 4 because he didn't use it anymore but it still had a passcode on it and he thought he remembered the passcode but unfortunately he doesn't, how do I completely restart the iphone and erase everything?

Simple Mobile on a Sprint locked Iphone 5?

I'm using a R-Sim 9 on a locked Sprint Iphone 5.

My carrier is Simple mobile. I just activated a phone, cut my sim card to fit etc…

I can send/receive calls as well as receive texts. However, I can't send texts, get online (other than Wi-Fi), or reach my voicemail.

Is there something I'm missing? It seems weird to have service but only have certain things work

Iphone 5s icloud and passcode

Okay so I bought an Iphone 5s off ebay, it is in the post atm, perfect condition.
I bought off ebay the seller found it last december but there was a passcode so he could not find the owner.So he sold it on ebay. The knowlege of it is limited but I got it for a bargin. I checked the EMIE code and it is NOT blocked.
but there are something i'm not familur with eg… How to get past the passcode
If the is the app "Find my iphone" could alert the buyer? Maybe
anyway i just want to know ways of factory reseting it but its not that easy

What's the best kind of phone case? (iphone 5s)?

I just got my iphone 5s and I have broken 2 iphone 4s and an ipad mini, I also managed to break an otterbox and a defender case. I've never tried a lifeproof case? Are those as good as they say they are? Do they actually work? What's the best kind of phone case? Preferably waterproof, and in colours other than black!

I dropped my iphone & now my screen is just black?

So like a month ago, my iphone 5c fell in the toilet. When I got home, I put it in rice and left it on the charger. After about an hour it turned on. I looked up things online and it said to take the back off of my phone so I did, and my screen had a red line going through the middle. But my phone still worked perfectly fine, besides the fact that the screen had red around it. Now today, when I was walking through the halls my phone fell and when I picked it up my phone was black. It was working this morning before I went to school, so then I just left my phone alone all day at school hoping it would work once I got home and put it in rice and I was getting my notifications, and hearing sounds throughout the day. So right when I got home I dropped it in rice. I put it on the charger and it won't stop vibrating every 2 minutes. Also, I tried holding the home screen button and lock button no luck what could be wrong? What should I do? & is it fixable?