A mobile electronic payment terminal, or a mobile electronic device, such as a mobile phone operating as a payment terminal to securely process electronic payments comprises a housing having a first side comprising a touch-sensitive display screen to facilitate the secure processing of electronic payments and can comprise a second side comprising a data entry keypad usable by the visually impaired to facilitate the secure processing of electronic payments. Alternatively, the data entry keypad usable by the visually impaired is in communication with the terminal or the electronic device, but separate from, the terminal or the electronic device. The data entry keypad can be attachable to and detachable form the terminal or the electronic device.