This test was not science, just and observation while driving through Finland during Christmas time.
I realized this situation while our family’s iPhone user was requesting someone to share WLAN network with their phone. Her old 3GS had completely lost signal. My Lumia 920 had H+ available. Same situation was with Galaxy SII. Jolla user had 3G available. Unfortunately she did not figure out how to share it.
I dont know if the location with the car made some tricks here, but at least all had subscriptions from same operators.
Interesting to check littel deeper on this. Power consumption of Jolla was a bit faster than others, but naturally it was also used more heavily as it had good connection more often.