Universal service is the principle that communication services essential to daily life must be available to everyone nationwide on fair terms, regardless of where they live or whether serving them is profitable. Japan's Telecommunications Business Act calls these "basic telecommunications services", and NTT East and NTT West are the designated providers on the telephone side.
Three things are guaranteed for telephone service. First, a subscriber line (landline): anyone, anywhere in the country, can apply and have a line installed. Second, public phones, which must be sited at roughly one per 1km square in built-up areas and one per 2km square elsewhere. Third, emergency calls to 110 and 119, which must connect free of charge from anywhere in Japan.
Telephone service is no longer the whole picture. Broadband access, such as fibre to the home, is also treated as a basic telecommunications service and is run as a separate scheme from the telephone one. As of 2026 the Ministry of Internal Affairs and Communications designates qualifying broadband operators as Type II eligible telecommunications carriers and publishes the areas that qualify for support. Treat the idea that universal service is only about landlines as out of date.
Keeping the guarantee alive costs money. Maintaining lines in depopulated areas and installing public phones does not pay for itself, so a subsidy scheme covers the shortfall. The legal obligation to pay sits with the carriers that provide telephone service: each contributes in proportion to the number of phone numbers it holds, and the pooled money is paid out to NTT East and West. Most carriers pass that cost on to customers as a line item called the Universal Service Fee, which is why fixed and mobile bills alike show a charge of a few yen per number each month. The per-number rate is reviewed periodically, and the ministry publishes the history of those rates (as of 2026). Two points trip people up: the charge applies per line, so several contracts mean the charge several times over, and switching carriers does not get rid of it because every carrier bills it the same way.
Landline subscriptions keep falling as mobile phones take over. Even so, public phones as a lifeline during disasters and emergency calls that work for everyone remain essential social infrastructure. For context, see our guides on using public phones in a disaster and deciding whether to cancel a landline.