It's one of those free things that really isn't free anyway.
It heats up your phone (severely - seriously), it eats battery instantly unless you're on a charger (more harmful heating), it reduces bandwidth, and it puts you at risk with your Verizon contract.
I might just take the link down, I don't want to encourage things, and it's not worth it.
Remember - your phone was designed to have either a carrier radio working or wifi radio working - not both, with full traffic and full power to all radios at once.
TANSTAAFL - there ain't no such thing as a free lunch!
'Nuff said.