Universal service guarantees essential communication services are available equitably nationwide regardless of location or profitability. Under Japan's Telecommunications Business Act, NTT East and West are designated universal service providers.
Three services are covered. First, subscriber telephone (landline) - anyone anywhere can apply for a phone line. Second, public phones - one per 500m square in urban areas, one per 1km square elsewhere. Third, emergency calls (110/119) - free connection guaranteed from anywhere nationwide.
Maintaining universal service costs money. Phone lines in rural areas and public phone installations are unprofitable, so a "Universal Service Fee" subsidizes the deficit. All phone users pay about 2-3 yen per number monthly, with funds distributed to NTT East/West. This fee appears on mobile phone bills as "Universal Service Fee."
While landline subscriptions decline with mobile adoption, public phones as disaster lifelines and universal emergency call access remain essential social infrastructure. See disaster public phone guide and landline cancellation guide for context.