I was just wondering if anyone had a: Motorola SURFboard® Wireless Cable Modem Gateway (SBG900), and were having issues with MagicJack? I'm looking to get a new modem and was looking at the SBG900, and saw a lot of people bitching about their VOIP phones not working with it.
Even if there were no issues with VoIP, I would not normally recommend a combination device. If you have a problem with your cable service, or just get a better deal elsewhere, it makes it hard to switch to DSL / WiMAX / whatever. Likewise, if you decide that you want a router with more wired ports, better wireless technology, etc., you'd likely have to replace the modem.
What's wrong with your present modem? If it's leased, you may be able to get the cable company to replace it for free with a newer model.