You can buy the AtB Summer pass in the app AtB Mobillett from the 27th of June up to and including 8th of August. Note that the ticket is activated upon purchase, and can not be purchased in advance. Purchase of a ticket does not reserve a place on board.
You can buy Summer passes for several people on the same mobile phone. The ticket can not be moved or forwarded to other phones.
Price adult: 990 NOK
Price children (6-19 years): 495 NOK
Remember that you must have valid identification with you on the trip.