I take issue with the premise that there is anyone who doesn't have time to send a better signal? It takes all of about 4 minutes to call the Capitol offices of your two representatives in Congress. They'll get your name address and you can make it as quick as "I just wanted to let Rep./Sen. so-and-so know that I am for/against HB/SB 1234." and it's done. You will absolutely spend more time looking up their phone numbers than you will on the phone.

You can do this while walking out of the office to the parking lot or metro station.