With Mobile Commons, calls can be initiated via web interface, SMS, or simply by dialing 866-581-7519 Try the demo now.
Advocacy customers of the Mobile Commons Platform use their software
to generate thousands of phone calls to congressional representatives
all around the country.
Using mapping data from census.gov, Mobile Commons built an open-source legislative district lookup tool available at http://congress.mcommons.com.
Combining this with other government data sources, they maintain an
up-to-date address book of almost 20,000 capital and district offices
for all federal and state representatives.