"Is it a PDA, a mini-computer or a phone? It's a bit of each. While the HTC Universal (commonly sold as the i-mate JasJar and other carrier-branded names) tried to be a phone, HTC has learned that most folks don't want to hold a handheld computer to their heads or keep in touch using something too large to slip easily in a pocket. Enter the Advantage, a handheld computer first and a phone second. In fact, the X7501's quad band GSM radio and triband HSPDA radio are there primarily to provide a network connection anywhere GSM and/or 3G is available. Yes, you can make phone calls, but you'll need to use the included wired headset, a Bluetooth headset or make do with the device's excellent speakerphone. There is no earpiece for "hold it to your head" style conversation." Read full review here.

This is a must read even for thoes who got this device already.