I know this is a VERY late reply, but...

A friend of mine demonstrated his N810 and confirmed that he regularly uses it as a to-ear handset with SIP ($50/YEAR for unlimited calling to/from Toronto numbers).

Here are some details:

- The only requirement for its operation is adjusting the speaker volume so that it's low enough for you to hear without people around you hearing and having a WiFi connection.

- He comments that thanks to the AMAZING wifi radio in the N810, he often can get a signal practically anywhere in the city, and even at low connection strengths (as low as 8%) he is able to have flawless conversations.

- He uses RTCOMM (the included SIP software) and not Gizmo, though this solution would likely work with Gizmo as well, or any VOIP software with volume control.

- The quality is amazing. He's never had a complaint, and most people believe he's on a home-phone rather than a 'mobile phone.'

- Thanks to the wonders of SIP, his SIP number rings on both his N810 and his home-phone (which is hooked up via an inexpensive SIP router). When he answers one of the phones, the others stop ringing. Thus, he needs only one number which works effectively as a home-phone number *and* a mobile number when he's on the road.

- Thanks to the multi-tasking capabilities of the tablet, he can easily convert to 'speaker phone' (ie. increase the volume), and do other things during a conversation (eg. look up information, jot notes, send emails, IM, analyze files, etc).

- Because it is SIP, he can carry out 100% free conversations to other friends or users in his organization that use SIP.

- Thanks to the inexpensiveness of SIP he has at least one additional number pointing to his N810. You can find these numbers (DIDs) for around $5/month for unlimited incoming.

- He is NOT a tech-savvy individual, so setting all of this up was relatively painless.

- Did I mention that this only costs $50/year (~$4 / month) for unlimited calling to/from numbers in Toronto?

- He describes the experience as "superior to any mobile phone he's used". In short: great quality, great price, and great flexibility. We reasoned that with WiMAX this solution would be unbeatable.

What a wonderful device the N810 is!

I just thought I'd post this message here, as it's useful information for anyone performing a search wondering if using an N810 as a mobile handset works, or how well it works. In short, it works EXTREMELY WELL.


}:^)~
YARR!

Capt'n (SIP) Corrupt