I am travelling to Europe and want to be able to still make calls. i foun the actical below which, using gizmo and sipdroind you can make free calls by going wifi. Hope this helps. HOWEVER, googlevoice is needed for Gizmo and I need an invite. Is anyone a member of google voice that can invite me: firstname.lastname@example.org 1) Setup or Login to your gizmo5 account page (www.gizmo5.com) 2) There should be a section explicitly for entering your Google Voice username and password. Enter your username and password. Also be sure to make a note of your full 11 digit Gizmo5 number 3) Download and open the SIPDroid app from the market. In the SIPDroid app, hit Menu and press Settings. Enter: Username: your 11 digit Gizmo5 number (e.g. 17475555555) Password: your Gizmo5 password Server: proxy01.sipphone.com 4) Turn on your phone's Wifi connection. Make sure SIPDroid is running (should be in the Ongoing section of the notifications drop down menu). 5) Login to Google Voice (www.google.com/voice). Add & Verify your Gizmo5 number. If you set up SIPDroid correctly and your wifi is working properly, your G1 should ring. It took a few tries for the phone to actually ring but eventually it did for me. Yes, you need a Google Voice account. No, no one can invite you except Google. Incoming calls on Gizmo5 are free. Ask further questions and discuss below!