"Performance of RIM BlackBerry Pearl (T-Mobile)
We tested the quad-band (GSM 850/900/1800/1900; EDGE) RIM BlackBerry Pearl in San Francisco using T-Mobile service, and call quality wasn't quite up to snuff. On our end, callers sounded a bit muffled, while our friends said though they could hear us clearly, our voice sounded a bit digitized. We could still carry on a conversation, but it just wasn't the same crystal-clear quality we've experienced with other BlackBerrys, such as the BlackBerry 7130c. Activating the speakerphone didn't help matters either. There was an echo on both ends of the conversation, though volume was adequate. On the upside, we had no problems pairing the Pearl with the Logitech Mobile Traveller Bluetooth headset. " what a lols......