Some Ketchikan residents will experience a disruption in their long-distance telephone service Friday night, lasting until early Saturday morning.

According to Ketchikan Public Utilities Telecommunications Division, their customers and those of other providers that use AT&T long distance will not have service from about 11 p.m. Friday until around 7 a.m. Saturday.

The disruption is the result of an AT&T upgrade. It also will affect those using AT&T’s cellular service.

To find out whether you will be affected, contact your phone service provider.