The Motorola Motofone is a dual-band GSM (850/1900) budget candybar shaped mobile phone. The display is simple - 2 lines, each with 6 characters. It is the world's first e ink phone.

Motorola MotofoneMotorola Motofone

The Motofone is thin (0.35" = 9mm). It is available through (starting from 20$).

E Ink display info: 
2-lines of 6 characters e ink display