Smartphone - Wikipedia
Japanese Flip Smartphone Has 2 Screens, Physical Keypad
You Will Flip over these Popular Phones! – Japan Everyday
Smartphone Design Hasn't Evolved in a Decade. That's About to Change., by Fast Company, Fast Company
Study Reveals How Much Cellphone Radiation You're Getting
I Went Back to a Flip Phone - Here's Why - Minimalism and Your Money
Z Flip 5 Japanese Monster Phone Case for Samsung Galaxy Z Flip
Flip phones have a cult following and also a clear message – less is more
Samsung says folding phones are now mainstream
Remember when we wore cell phones on belts? This Motorola phone started the trend - CNET
Motorola's bendable 'e-bangle' phone revealed — how it works