Are-IP.com

<<<... You can also connect to a Bluetooth headset for listening to music or making VoIP phone calls. But there's more to life than wireless networking. The fastest way to have the N810 exchange files with your PC is hook the two together by USB 2.0. As soon as you do this, both the handheld's memory cards appear as removable hard drives on the desktop or laptop, with no additional software needed. Incidentally, the device can not charge through a USB connection, so you can't save on bulk by carrying a single charge/data cable.

Skype and VoIP

Just because the N810 isn't a smartphone doesn't mean you can't make phone calls with it. It comes with several applications that let you talk with someone directly over the Internet, including a version of Skype. This application lets you call someone who is also a Skype user and talk back and forth completely free of charge. The other person might also be talking on an N810, but they don't have to be; there are versions of Skype for a wide variety of devices, from desktops and laptops to handhelds running Windows Mobile. These are available for free, so your friends, family, or co-workers can download one very easily. You can even use Skype to call regular phones, but this costs money. When you're talking, you can either use this handheld as a speakerphone, or you can use the included headset, which works like the the ones for mobile phones. There are other VoIP options for this handheld, but so far Skype is the best. Still, development on the others is ongoing. The N810 includes a front-facing VGA camera clearly intended for video chatting, but at this point there are no applications that take advantage of it, not even the ones that come bundled with this device. more>>>