I'm currently looking at getting either a IPAQ 4350 or the 5550, BUT what I
really need is built in WIFI and the ability to connect to the internet and
a few (very few) phone calls when I need too. I believe I read somewhere
about an expansion pack that could be added to the IPAQ's that would allow
me to use it as a phone, is this correct? or does it just allow me to access
the internet? Does anyone have any good links?

P.S. I've already looked at the Treo 600 and prefer the IPAQ