Alosso,my friend i was promoted to master at level 58,tm level 78! One more time there are no set requirements in mobile! They may have been stated in these forums by people guessing but not by wgt. Ty.
Mind you that the difference is not in the device that you play but in the games that you play!
You are obviously playing many ranked rounds, thus average and saturation are the variables controlling your promotions.
OTOH, players NOT playing these but "mobile" games, HTH + Coin Rooms, would never rise by these criteria. Instead, they are promoted in tiers when they reach certain levels.
If you look around, you find players in higher tiers with 150 averages - impossible the traditional way.
WGT scarcely states anything concerning this topic.