If you're going to post a quote, why not link to it?
The 5GB cap is for Mobile Broadband. There is no cap for data use on the phone. Here's the link:
(
Sprint Terms & Conditions)
At least 2 or 3 people have posted in this thread that they have exceeded 5GB usage on their phone with no consequences. I believe them.
I have not seen a single post in this thread by someone who has exceeded 5GB data usage on their phone and gotten a charge.