I use google voice for voice mail. I have it set up to send me a gmail when I get a voicemail, and it usually works great. But on my train commute, there is one section that is underground and does not get any voice or data service. This is followed by another section that gets voice service but no data service. When someone tries to call me when I am in the no voice/data service area, I do not get a voice mail notification until I am back in the full voice/data service area. Due to the train being stopped in the voice but no data service for some time, I did not get the notification for about 20 minutes. My question is, if I set up google voice to SMS instead of email voicemail notifications to me, will I then get the notifications as soon as I am back in voice service territory? That is, does SMS use voice while email requires data service? I have a limited text message plan, so I was hoping to not use up text messages with voicemail notifications. Also, I never received a notification from the Missed Call app. Is this because google voice picks up the call before it even reaches the phone when I am not in a voice service area? Thanks for any input on this.