Dorayaki
King Bowser
We know smartphones and other modern gadgets exist in Mario world, but mainly in metropolis like Brooklyn / New Donky City and Diamond City, and most people from these places (Mario bros, Pauline, Wario and Warioware Inc crew) all own smartphones.
Meanwhile, if I remember correctly, the main kingdoms in Super Mario games (from Mushroom Kingdom to all other kingdoms where mainline and RPGs take place) don't seem to have smartphones.
Altho some of the Mario spinoffs have shown satellites and TV (such as racing broadcast from Mario Kart), telecom network operators seem to not exist in Mushoom Kingdom. So even if Mario brings smartphone to Mushroom Kingdom, it's also impossible for him to surf internet or make a dial.
Let's assume that smartphones can still be charged in the main kingdoms, do you think smartphones make any difference in their offline mode during the heroes journey to save the world (regarding to both mainline and RPGs)? Or they would be totally useless since heroes only need to fight with barehand or magic?