Check out the KY-O1L, the credit card-sized 'world's thinnest phone' | TechSpot
Amazon.com: Hipipooo Super Small Mini Smartphone 3G Mobile Phone 1G+8G 5.0MP Dual SIM High Definition Quad Core Dual Standby Unlocked Small Phones Childs Phone Pocket 2.5 Inch Android Mini Cellphone (Black)
Original Servo Mini Smartphone Android 3" Screen 2gb+32gb Dual-sim Google Play Wcdma 3g Cell Phone Unlocked Small Mobile Phones - Mobile Phones - AliExpress
OPPO's credit card-sized triple-folding phone is the logical evolution to smartphone technology! - Yanko Design