…or you can do what I do: use a PPC and install WiFiRouter.
Most of the HTC phones nowadays comes with the option to enable “Internet Connection”. This allows you to use the phone as a 3G/HSPDA router, which enables your laptop to connect to the Internet/Intranet through Activesync. Because I did not pay for the 3G/HSPDA service, I installed WiFiRouter instead that makes your phone as a WiFi router (WiFiRouter also supports 3G/HSPDA as well…in case your PPC phone doesn’t come with 3G/HSPDA connection sharing).
Note that you will need to get the PCCW (or other service provider’s) mobile and unlimited WiFi or 3G/HSPDA plan. The PCCW WiFi plan also includes 60mb of 3G/HSPDA data per month (3’s plan includes 100mb). I prefer PCCW because there are more WiFi hotspots and I frequently go to Starbucks….