This sounds promising.
Google Voice is available by invitation only. But they are letting anybody with a ".mil" e-mail address get a Google Voice account
invitation. According to
SGT Dale Sweetnam, who is working with Google as part of the Army's "Training with Industry" fellowship:
When you deploy, your life is put on hold. While you live and work in a different world, everyone else moves on with life back home. Your family and friends keep moving, and this sometimes means it's just not possible for them to stay awake until 2 a.m. to receive a phone call. Calling Iraq or Afghanistan is seldom an option.
Google Voice provides a solution to some of these problems. Service members can set up an account before they deploy. Or if they're already deployed, families can now set up an account for their service member. Loved ones can call to leave messages throughout the day, and then when that service member visits an Internet trailer, all the messages are right there. It's like a care package in audio form.
I signed up for an account when I came to Google, and it's already making communications much easier here in the States.
I just applied for an invitation. We've been planning on using skype to stay in touch, but free calls and free voicemail over the internet sounds like a good plan too.