Are foldables finally ready to go mainstream? Apple Technological advances often come with growing pains. This is no less true of phones. The 1984 "brick" phone (DynaTAC 8000X) required users to carry over 1.7 pounds of weight for only half an hour of talk time, at a hefty price tag of $3,995. Foldable phones are not so troublesome, but I still struggled to fit the Samsung Galaxy Z Fold 4 in my pocket when I first got it. What's more, the size of it kept prompting friends to ask why I was carrying two phones around. I wish I had…