Sound and Connectivity
Sound output relies on downloadable polyphonic and MP3 ringtones, as the E770 does not feature a loudspeaker or a 3.5mm jack. Connectivity options include Bluetooth 1.2 with A2DP for wireless audio streaming, though it lacks Wi-Fi, which was not a norm during the release. The proprietary USB connection provides a means for data transfer but limits compatibility with broader external devices.