If it seems like every company is now hawking a foldable phone, you're not wrong. After years of technology experiments and lots of engineering refinements, the big phone designers are going mainstream with models that have ironed out many early problems like visible screen creases. And that's all before Apple jumps into the market with the rumored iPhone Ultra.Samsung's Galaxy Z Fold 7, for instance, is thin enough to feel like a standard slab phone while folded. The new Honor Magic V6 has a larger battery capacity than the Samsung Galaxy S26 Ultra. Huawei's Mate X7 has a 50-megapixel main…