Five UK broadband and landline providers will now automatically compensate customers when services do not work.
From Monday, customers who experience delayed repairs, installations or missed engineer appointments will be compensated, without having to ask.
BT, Sky, TalkTalk, Virgin Media and Zen Internet have joined Ofcom's scheme, which is not compulsory.
Hyperoptic, Vodafone, EE and Plusnet have also committed to the plans.
According to industry watchdog Ofcom, there are 7.2 million cases each year where broadband or landline customers suffer delayed repairs, installations or missed appointments.
Previously, only about one in seven broadband or landline customers received compensation from providers for these delays.
Ofcom consulted on enforcing formal regulations regarding compensation of broadband and landline services in 2017.
However, some service providers then approached the regulator independently and offered to pay compensation to customers.
This led to Ofcom releasing details of its voluntary automatic compensation code of practice in November 2017.