I've had a lot of issues with my GV that is connected to my Tmobile in the last few weeks. Used to be that when someone called my Tmobile cell number, my iPhone would ring and then GVoicemail picks up after 25 seconds. Now it rings, then my obihai ring before going to GVmail. If someone calls my GV number (not my mobile number) - before it would ring on both my obihai and my cell then go to GVoicemail. If I hit ignore on my cell it would go to Gvoicemail. Now if I hit ignore (end) it goes back to obihai again. Very annoying. I posted on Google Voice forum and they're investigating.