If someone were to phone my cell, my voicemail message informs the caller that I can't get a signal during the daytime, that my phone is turned off, and alternatively gives a work number, a land line, in case of emergency as long as I know you (and you are not a bill collector). It would be faster and more convenient for the caller to drive to my actual work location, smack me upside the head, and deliver the message personally than to call my cell phone.
Having so many G's means you can do more things with your phone, mostly the same things I can do with my computer that I sit in front of all day long at work. If I could get a signal, all those extra G's mean I can download and use hundreds of cool apps - great - I'll do that when I can get a signal. I can browse the web faster - if I could get a signal. I could download large files, if I could get a signal. I could play music and watch streaming video - if my phone would work. Send emails with attachments, no problem. Will get on it as soon as I can get a signal. Play 3D games, video conference, rapid file sharing - easy, when and if my phone ever gets a signal.
3G will soon become 4G which will be when I switch to yelling until someone can hear me.