What is the phone number to order a taxi in Oslo or Tromsø?
If you want to order a taxi in Oslo (Maura) you could call: +47 952 00 989 (Romerike Taxi) or if you want to order in taxi in Tromsø you can call: 03011 (Tromsø Taxi).
How much does a taxi cost to your rental station?
If you want to find out approximately prices for a taxi, check out the http://www.taxikalkulator.no website. Otherwise: Airport <-> Office in Oslo ca. 650 NOK and Tromsø is somewhere around 150 NOK.