At home I use Vonage for phone service, so my phone is attached to the Internet.
I travel reasonably often but don't have a cellphone. Increasingly, hotels are charging ridiculous prices even for local and 1-800 calls, but I do have broadband Internet because I need it for work, so they pay.
Finally my question, can I get SIP on my laptop, and call home, bypassing the POTS (and for that matter, Vonage) entirely? (I realize I could do PC-to-PC calling to my home computer from my laptop, but it will never work unless my wife can just pick up the normal phone).