jeep99, do you honestly expect any of that to be comprehensible to the original poster? You might as well be speaking greek.

dckw1, the N800 has a couple different ways it connect to the internet. The first is WiFi, which is marketing speak for a technology called 802.11b or 802.11g. The basic idea behind Wifi is that you connect a device called a wireless access point up to a broadband connection (typically DSL or Cable) and it provides a bubble of wireless connectivity within a range of a few hundred feet of the access point. You can buy one of these yourself from most electronics retailers for $50-75 and connect it up to your own broadband connection at home and then be able to get online with your N800 anywhere within range. Many coffee shops, libraries, malls etc. offer access for free or for a small charge. There are some businesses like Starbucks that will almost univerally have Wifi access available, albeit for a monthly fee or steep daily rate.

The second way to get online is via a cellular internet access/data plan through your cellular provider. Basically, for a monthly fee of $30-$60 (assuming you are in the US) you can get online from your cell phone and many cell phones (but not all) can share that internet connection to another device such as a laptop or your N800 via a Bluetooth connection. Bluetooth is a set of technologies that allow low power devices like cell phones to exchange data wirelessly over short range.

I use my N800 with my Nokia N95 phone on t-mobile and can get online pretty much anywhere I have cellular service. My service through t-mobile costs me about $20 a month for the data plan, although I believe they are charging $30 or so these days. ATT/Cingular and T-mobile primarily are using an older, slower standard for cellular internet access called EDGE. EDGE delivers an internet experience a little faster than an old dialup modem. Ok for checking email and light web browsing, but you don't exactly want to be downloading Youtube videos over it. Both T-mobile and ATT are rolling out a faster, more competitive technology called HSDPA, but it is only available in select major markets and only works with a few newer (and expensive) handsets. Nationwide on ATT and T-mobile, EDGE is the name of the game.

Sprint an Verizon are both using a better technology than EDGE which usually goes by the technical name of EVDO revision A, which is MUCH MUCH faster. It is more like an average speed DSL connection. You can download videos, mp3s and surf the web at a much better speed. Unfortunately, Verizon currently caps how much data you transfer per month to 5 GB. I personally think Sprint's terms, speed and coverage are better, anyways.

VOIP stands for voice over ip and is basically a way to use your N800 to make voice calls over the internet. There are a couple programs that let you do this. Basically, all the VOIP software will let you call other VOIP users for free, it is just making and receiving calls to the POTS (plain olde telephone system) that costs money. I use a program called Gizmo Project and have had great success using it internationally to make cheap phone calls. Another popular program is Skype, which can also make and receive "normal" phone calls, as well as call other Skype users for free. There are some other options like Google Talk and some generic SIP support (in beta/testing) as well, but I haven't explored those options much.

I hope this information was useful to you. You can find out a lot more and find recommendations of specific phones to use with your N800 by using the search function for these forums. Please try to search for common terms here or using sites like the Wikipedia before posting a new thread on a topic which has already been beaten to death. If you would like further help, I am always available commercially