NGM-Mobile Billy. Display diagonal: 50.8 mm (2 "), Display resolution: 220 x 176 pixels, Display: TFT. Compatible memory cards: microSD (TransFlash), Maximum memory card size: 4 GB. Main camera resolution: 640 x 480 pixels. Data network: GPRS, GSM, GSM bands supported: 900, 1800, 1900 MHz. Ringer type: MP3, Audio formats supported: AAC, MIDI, MP3, WAV