Unlockng a verizon iphone 4s?

I was given an Iphone 4s by my ex a while back as a gift. When they gave me the phone it was not activated or on a contract. The previous owner had it on a Verizon contract, but it had been removed because she got a new phone. I need to know how to get the SIM card slot unlocked so that I can use a UNITED STATES STRAIGHTTALK SIM CARD, not international. I heard jailbreaking unlocks it, but does jailbreaking keep the phone where you can update it and do everything a normal iphone can do?

What is the best device for storing and playing music?

I have about 700 songs in my iTunes library on my work computer. I don't have a computer at home.

What is the best device for storing and playing those 700 songs?

I have an iPhone 4s, and there are about 45 of those 700 songs on it, but I don't understand the iCloud and what songs I actually have or don't have on my phone… Half of those 45 songs that are supposedly on my iPhone have gray dotted circles and/or exclamation point icons next to them don't even play when I want them to. The whole iCloud is super frustrating to me, and I can't even figure out how to just delete every song from my iPhone and iCloud.

So, aside from a smart phone, what is the best way to store and play my 700 songs?

Is it ok if I talk on the phone a lot with a iPhone 5s?

I talk on the phone a lot and we fall asleep on the phone with each other everyday. I was thinking of getting a iPhone 5s but I don't know if I use it that it might mess up on me. Is it possible?

Added (1). I forgot to out I'm on the phone with my girlfriend n we talk alot

Why is my IPhone 5 not connecting to the Wi-Fi at my house?

It was working perfectly fine this morning, and out of nowhere it turned off. I checked my internet but it's fine cause its working on my ipad and mac. I tried reseting the network setting but its still not working. And I'm making a big deal cause our family plan's internet is limited, and I don't want my dad to kill me.

I can't connect my iphone to itunes?

I'm using a lenovo yoga laptop. Quite recently i updated to windows 8.1 and ever since i can't connect my iphone to itunes, and the songs in itunes can't be played. I upgraded itunes and my phone to the latest software but it still doesn't work. I uninstalled itunes and installed back still doesn't work. Now i can't add songs to my music player or play any songs at itunes. Can anyone help me on what to do? I'm not sure if windows 8.1 is the cause. If it is is there a way for me to downgrade?

Should I buy an iPhone 4s now?

I've found one for a good deal online but I'm worried that when Apple does a new iOS update, the iPhone 4s will be too old to get it and I won't be able to update and use older apps like Snapchat etc. Which is basically what I'm buying the phone for haha! Or should I just buy a ZTE Blade V and save some money? Advice please!

Added (1). So I've found the ZTE Blade V for roughly £130 and an iPhone 4S (seller refurbished) for about £190.