So what was so great about NMT? Well, NMT had a superior range compared to other systems. Even if you were far away from a mast, you could still place a call. This was particularly favorable in countries with a sparse population, such as Iceland or northern Sweden. Since later systems often reach a large percentage of the population of the country, there are still large land areas that have no coverage at all. NTM, on the other hand, reaches almost the entire land surface and also a good distance out to sea.
The longer reach in the system was due to two different things. Partly, NMT had a lower frequency, which allowed the signals to travel longer. With the lower frequency, the wavelength became longer and so you could be farther from the mast. In addition, NMT phones had a higher transmission power. An NMT 450 phone is allowed to have a transmit power of 15 watts while a GSM phone (second generation telephony, 2G) has a maximum of 6 watts only.