Let the hive mind of Engadget get that for you.
"I've found myself using my PC for a lot of conversations lately, and I'm also considering recording a podcast to share with anyone who will listen. There are tons of USB headset / microphones out there, and I'm hoping someone has some solid recommendations based on experience. I'll consider both headsets and standalone mics, by the way, but I'd like to keep the bill under $100 if possible. Help!"
I began by thinking "How stupid!" but after visiting the site, I understood that it can actually be used advantageously in certain social situations.
Anyhow, for those wondering what the actual connection is between Sprint and Mobile Faker, it's just a simple circumstance of Sprint being the first carrier that the software supports.
Other carriers are on the way, according to the developer's website. T-Mobile, Verizon, Cingular (oops, AT&T), Nextel, and Boost all seem to be shortly behind. Pricing seems to be $3.50/month.
Oh, and on top of that, anyone at all can use their faux call service, for a buck a pop.