Based on available information, the Sonim XP3300 Force is considered the strongest mobile phone.
The Sonim XP3300 Force has officially been recognized as the "World's Toughest Phone" and holds a Guinness World Record for its durability. According to sonim sets new guinness world record™– now the world's toughest phone www.sonimtech.com › about › news › sonim-sets-new-guinness-world-rec..., it survived a drop test from 25 meters (approximately the height of a ten-story building) onto concrete without sustaining operational damage.