The goTenna Mesh is certified for the 28 European Union/European Commission countries, where such things are covered by the Radio Equipment Directive (RED). Complicated stuff, but Iceland is not a member. You might assume that the goTenna is not certified there in the absence of documentary evidence that it is. However, from the FAQ here:
What countries are supported?
goTenna Mesh will auto-tune to RF frequencies that are legal for use in the following countries:
United States, Canada, Albania, Andorra, Australia, Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Greenland, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Macedonia, Malta, Monaco, Netherlands, New Zealand, Norway, Poland, Portugal, Romania, San Marino, Serbia, Singapore, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
As for authorization to use the 900 Mhz ISM band freqs, I suspect that it may be classified as something different than an “SR (search and rescue?) device” perhaps? Or they might be behind on updating the website? If goTenna is shipping theree, its legal. There was some brief holdup in the beginning while a few places got last minute certifications in so some delays, but I think the last of those was done some time ago.