Is it possible to use a windows mobile device (HTC HD2) to connect the Ipad to the Internet?

Yes, I'm doing it no problem using WMWifi Router. It's £15 But there is a free trial version.

Works a treat!

But is it also possible to use 3G and not WIFI?

Not sure I understand what you are asking, if you have a 3G iPad you can connect via 3G. If you have wifi only, you can connect to your mobile, via wifi, which in turn connects to the web by 3G.

The only way I can think would be over wifi to your winmo mobile phone. I dont see any advantage to using the phone's 3G (the only way would be bluetooth, but as far as I know its not supported on the ipad for that). Wifi is capable of higher speeds than 3G, so there shouldnt be much speed drop by using wifi.

Well, the obvious advantages to tethering this way are:
Why pay twice for data plans if your phone has one already?
Why pay AT&T anything if your phone is with someone else?

This is for when a wifi hotspot is not available - you turn your phone into one.

I use the aforementioned free version of wifi tethering on my WM 6.5 HTC Touch Pro 2. Works fine.
Look for XDA-Tom_Codon_CM_Wifi_Internet_Sharing_VGA on the web.

I just upgraded my HTC Touch Pro 2 to Windows mobile 6.5 and couldn't get the tethering working again with the free cab that kierandill mentioned, so I had to go with the WMwifi router that Anfield800 mentioned. I'm using the free trial.

Something to be really cautions of - a lot of phone companies don't allow tethering, and some are deleting their unlimited data plans, so if you use this, you may be racking up truly tremendous bills. Be really careful.

I have Sprint with an unlimited data plan, and with just casual browsing on my pc and iPad for a couple of days, I've already racked up 163 mb of data use... That's a lot for not much usage. I'm concerned that Sprint and others will catch on and cut it off so tethering won't be permitted anymore. I've read of some who have tethering bills in excess of $1,500 for a month's bill.

Hope this is helpful (for my first post here!)

Larry

Thanks,

I didn't know the expression Tethering, but that is what I meant. I do not want to have two data-plans and therefor I want my excisting phone/data-plan to connect the Ipad with Internet.
I understand that it is possible, with the proper apps on the Win Mobile Phone, that I can connect the Ipad to Internet. I do not need Ipad 3G and have can connect Ipad with the phone via Wifi. Is this correct?

correct. Just be aware of the limits - mainly the battery life on your phone. To do tethering, you need 3G and Wifi turned on. That could drain a phone pretty quick. It works great in a hotel room with your phone plugged in though. Also, check the fine print on your data contract for limits.

If you are running a Windows Mobile phone, you should be running a custom Rom. Almost all of the custom Roms make sure that the carrier cannot tell if you are tethering or not. I have a TP2 on Sprint and I use mightyrom to tether, and its flawless. Also, you dont have to worry about the amount of data if you are on sprint, people regularly use 50-100GB a month on that plan for years and have never even been warned. Sprint is the best. That is all.