Service takes place on Sundays at 11 am (10 am in summer) in Norwegian language.
Free entrance.
Wikipedia https://en.wikipedia.org/wiki/Old_Aker_Church
More information http://www.visitoslo.com/en/activities-and-attractions/attractions/architecture-history/?TLp=13497&Old-Aker-Church=
Phone +47 23 62 91 20
Address Akersbakken 26, 0172 Oslo, Norway
Coordinates 59°55'25.262" N 10°44'50.052" E