As of 2015, there are three major carriers that offer mobile connectivity for tourists, with Telenor having the best coverage, followed by Netcom. A passport is required to purchase and register your SIM card.
Top Prepaid SIM options
1. Telenor
Cost: Sims are 49 NOK ($7.50 USD), 10 NOK ($1.50 USD) for unlimited data lasting one day, though capped at 100kb/s download speeds after 500 mb. Link
2. Netcom
Cost: Sims are 99 NOK ($15 USD), 29 NOK ($4.50 USD) for 500 mb data lasting one day, or 200 NOK ($30 USD) for 2 gb data lasting two weeks. Link
Where to Buy: Authorized outlet – they must register your SIM to activate it
Call for Information: 800 30 301
Call for Emergency: 112
SMS: Send INFO <your question> to 1980