So far there is no montly fee for the Garmin service. It's $2.99 for a 24 hour rental period. The GPS enabled GoogleMaps is still available free of charge. I think they'll probably be guaging the demand for the Garmin service and if demand is high, they'll probably do a longer rental period for the service.

What if you're already set up with Go Phone service???

As an update to an earlier comment, Helio now offers free mobile to mobile.

I have the Helio Drift. I don't see where the complaints come in about Helio being more expensive. This is the cheapest service I've ever had for what's all included. i have the all in plan and with tax and everything pay about $80/month. I do A LOT of text messaging. I never come close to go over my minutes because of the unlimited nights and weekends (I work all day Mon-Fri anyway, so no need to use my plan minutes most of the time.) I mostly text message and LOVE that I can send and receive as many text as I want. I'm a clubber and text messaging is the easiest way to communicate in loud clubs, so I'll easily send at least 100 text message in one weekend alone. The Myspace mobile thing is great. When I do go out, I take tons of great pictures and instantly upload them to Myspace on the spot. And my service on Helio has been outstanding. I have not experienced a single dropped call in the six months that I've had the phone. I came from Cingular and got use to dealing with a lot of dropped calls, dispite their advertising being the network with the fewest dropped calls. I've also had to call into customer service a couple of times. I haven't had a single problem with their customer support, and, in fact, their customer support has been the best from any cellular company I've dealt with. I had some issues with my phone when I first got it and I called them up to see if they could discount that month for me and they took $50 off for me. Dealing with Helio has been the best experience I've had as far as cell companies go. My only gripe: No flip phone. I LOVE flip phones.