Alternately, you can switch your calls to Google Voice or another call-routing service and pick up your calls via Skype/Gizmo - if you don't want to give people the new number, you could consider just using call forwarding. Or just cut out Google Voice altogether and get a Skype subscription.
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You can hold out for an AT&T microcell - basically an IP to GSM converter: http://www.engadgetmobile.com/tag/microcell/
Alternately, you can switch your calls to Google Voice or another call-routing service and pick up your calls via Skype/Gizmo - if you don't want to give people the new number, you could consider just using call forwarding. Or just cut out Google Voice altogether and get a Skype subscription.