OK, OK...the topic is a little bit misleading. But it IS a free service, and it IS phone-related. There is a service that I've been a subscriber to for about 2 months called "GrandCentral." It is currently in BETA stage and was purchased by Google recently. It is invite-only, and I have several invites remaining, hence this posting.
Basically, this service allows you to consolidate ALL of your phones to one number, and perform alot of VERY convenient things. You can have ONE number ring to your cell, home, and work phone numbers, and have ONE central voicemail. Additionally, you can do cool things like say you're talking on your house phone and want to leave, you can transfer the call to your cell! You can even check your voicemail from the internet! The features are unbelievably cool, plus the bit of cache of being invited into an invite-only beta program, haha. You can also get a phone number from virtually ANYWHERE. I live in Ohio, and I have a New York City number. It'* also good for people who switch providers alot, or lose their phone service for whatever reason, and have to get new numbers. Your Grand Central number will never get taken away or change, so if your cellphone number ever changes..you just update it in Grand Central. Your number is now attached to YOU, rather than a service, place, or device. It'* really cool. Go to http://www.grandcentral.com/home/features
to see everything it does. It even does things that PAY services charge you for (i.e. ringback tones, etc)
and here is a video demonstration of it: http://www.youtube.com/watch?v=rd5gHKU-qnQ
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