Can I trade my phone in for the iPhone 6 or 6 plus?

I have sprint and tecnoically my contact end in August but last year around August my mom added someone on our contact around August or September. Now she said that if I upgrade it would take away my unlimited data! Same with my mom, sister and dad! But I asked my dad about me upgrading and he said thy I can just trade in my phone for the iPhone 6 or 6 plus and just sign a new 2 year contracts I honestly need a new phone so bad. I have the iPhone 4. Lol and it's shattered on the front and back and works so slow and has waterdamage.

Is it safe to keep using my iPhone as normal while ios 8 is downloading?

I have an iPhone 5C, and I've just started downloading ios8. I've noticed it's going to take a while to download (about 22 hours it says just now), so is safe to keep using my iPhone as normal while the update is downloading?

I understand it would be best to not be using my phone when the update is actually being installed, but just now it's only downloading so I wouldn't have thought it could do any harm, but I'd just like to double check.

Thank you for any help.

Added (1). If it is safe to use my phone while the update is downloading, will I get a notification when the installation is about to start, so I know when to stop using my phone?

Is there anyway to stream videos from my Iphone to my TV wirelessly?

At my cabin I have LTE service on my phone, but no internet or Wi-Fi. Is there anyway to stream videos from my Iphone to my TV wirelessly? Here is a BIG catch. I wanted to make a network with a wireless router and stream that way but I want to be able to still use LTE off my phone. Any hacks to do that?

Ios 8 will be the death of me?

Okay, so to download Ios 8 on my iphone 4s I need 4.6 gb of data, I have 3.6 and am unable to delete anything else, seriously, I deleted all my songs, contacts, photos and apps, and its still not enough. What do I do? Someone please help!

App for a selfie that's view is not mirrored?

Are there any apps that give a selfie view that is not mirrored without needing to take a picture, like the camera on the iPhone? I'm just tired of deleting the pictures and taking new ones every time I do my hair.

Jailbreak ios 7.1.2 vs ios 8?

I have an iphone 4s running on sprint 3g. My upgrade is in 3 months, and I was wondering if I should jailbreak or upgrade. Is jailbreaking safe?