If you are concerned whether your cell phone will work during your trip, you shouldn’t worry as mobile phone service in Norway is of high quality. The mobile connection network in Norway is well-developed and therefore you most likely won’t face problems with having cell phone reception in any of the Norwegian cities, large or small. Plus Norway mobile phone coverage is great, with GSM and 3G practically everywhere in the country.
Nevertheless, there may be cases when it might be more difficult to find a signal, for example, if you are somewhere on the road far from the towns, in deep fjords, or in the remote wilderness.