High Quality Content by WIKIPEDIA articles! The Samsung SPH-A640 (also A640) is a tri-mode dual band cellular telephone developed for PCS carriers like Sprint Nextel. It contains an internal antenna, but removing a protector behind the battery slot reveals an external antenna slot. Offering many of Sprint's features, such as SMS messaging and ReadyLink push-to-talk walkie-talkie technology, the A640 has an internal 65k ufb, 1.82 inch display with external Organic LED display. Including many now-standard features, the A640 includes a built-in camera, text messaging, and Bluetooth technology. VoiceSignal software enables you to place calls and access your contacts list using just the sound of your voice.

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