That's nothing. In the 60s, mobile phones required a whole room full of relays, reel-to-reel, and blinking red lights. You needed a government grant to buy one and three secretaries working 24/7 to operate it.
It was truly a great time for impressing people with your phone.
I bet you could scrape a base station together using a USRP and terminate the calls over the internet. The FCC might show up with baseball bats though.