Three (http://three.co.uk/) doesn't sell it so I am not sure if it would work if I just got a SIM from them. Would it have 3G speed? I take it there's a Skype client that works by now? And is there support for Apple's iSync?

The N810 does not have a SIM card slot. It will use Bluetooth DUN (and, with an add-on, PAN) to use a mobile phone to connect to the network.

I know three sell the Sony Ericsson W890i - which I'm using it with on Vodafone. I'm fairly confident most of their phones will work if they have Bluetooth.

you would also need a data plan or make sure your account has internet access enabled outside of threes' garden wall..

The N810 doesn't have a sim slot, you'll need to pair it via bluetooth to a mobile phone or use over wifi.

The N810 has a Skype client direct from Skype themselves. Can't really answer the mac isync question as I don't own a mac.

I have the N800 and had the N810 on trial for a few weeks, both are the same apart from the keyboad and gps on the N810, so if you want to see what you can do with the N800/N810 look over on my website and see the What's installed on the N800 posts.

I've successfully used the N800 in the UK via a bluetooth phone on Pay-As-You-Go with Orange, O2 and T-mobile. It's very cheap to just get a Pay-As-You-Go SIM from a provider and try it out. Sorry but I haven't tried Three.

In my opinion T-mobile is the best. In an HSDPA coverage area (with an HSDPA-capable bluetooth phone) web pages seem to load near-enough to WiFi speeds. T-mobile pay-as-you-go data is maximum of £1 per day for up to 40 megabytes.

Strictly speaking, the T-mobile tariff is £2 per day for "handset as a modem with a computer", but the staff in my local T-mobile store felt that the N800 was a handheld device, not a computer.

One thing to watch is that some of the operators force you to go through their proxy servers. When using O2, this forced me to get the mobile version of some websites (even though the N800 has a real grown-up web browser). Even with T-mobile, results vary a bit. When I was in Sheffield (on HSDPA), I could only get the HTML version of Gmail whereas in other areas (on 3G) I get the full JavaScript version. However, Google provides a command-line parameter that you can add to the URL to force the real version of Gmail to be used.

I wrote up the connection settings that I used, because it took me a while to work them out myself.

I use a three PAYG sim with the £5 internet add-on for 30 days, in a Nokia 6120 Classic. Works really well with my n800, and is really good value for money. This is internet (web and email mostly), not true broadband, but most things I've tried except VOIP work with it. Skype even works fine. You can also pay 50p per day with three.

I've not had any problems with coverage, except in the more rural parts of mid wales, and the speed is plenty quick enough.