Why won't my iphone jailbreak?

Okay so i have been trying and trying to jailbreak my iphone for 5 days now. Its a sprint iphone 4 running ios 7.0.3 i need to jailbreak it to use it with pageplus. It was jailbroken previously but then i restored it and updated it and all that good stuff but my phone number was still on it and everything was fine. Then one day i took the number off to put my moms on it and thats when it all went downhill, it wouldnt let me call *228 to activate it and it says i'm unable to make calls to this number so after days and days of trying to figure this out i was told i need to jailbreak it again hence what leads me here.

I'm using the latest verizon of redsn0w and trying to set my ios back to 6.0 but it just won't budge. It goes through the jailbreak process and says that its done and everything else so i 'just boot' it after selecting the 6.0 ipsw and then it shows the pineapple for about 10 mins or so and then blacks out and then comes back on with the regular apple icon and reboots normal. I don't understand and i have a slow computer so its hard to really do to much research. I'm literally going insane because it just don't make sense to me, i'm about to just give up and sell the phone as much as i don't want to.

Someone please help me and guide me in the right direction for this because i just wanna be able to use my phone.

Added (1). I don't know how to reply below but how do i revert to ios 6?

This is why you shouldn't jailbreak your phone.

Honestly I can't help you. I have dealt with a similar problem involving an iPhone 3GS, but I can't remember what I did.

Has nothing to do with how fast your computer is.

Jailbreak is not available. The latest jailbreak will only work with 6.14. I thought this was too good to be true.

So if you want to jailbreak more so than run iOS7 you will need to revert back to iOS6.
It's simple but will steal an hour of your day.

There's no jailbreak from iOS 7 yet and as far as I know you can't downgrade from iOS 7 to iOS 6 anymore so you are stuck until the iOS 7 jailbreak is release. If you go to www.howtoidevice.com you will find some details…

Dear friends there's no jailbreak out for iphone 5 or 5S, last day i also try to jailbreak my iPhone but i can't, But there's one idea You can try at 1st with Redshow Software