I've also noticed that Google Voice, despite its awesome feature set, is just not very reliable.  I absolutely prefer to use it as my primary phone number, but I've noticed repeated problems with just using the service, a good deal of the time.<p>Outbound calls (from my phone) that use the Google Voice service often times just don't connect.<p>Inbound calls often don't ring my phone, and go straight to voice mail.<p>I've never noticed an SMS message fail altogether, but I have seen a number of occasions in which it was delayed so significantly that it might as well have.<p>Perhaps the most important glitch to me (and this isn't a service complaint, so much) is that MMS messages are just ignored.  I don't receive them, or any notification that one was sent, and from what I can tell, there is no message / delivery failure sent to the sender either.  This is a problem for me.<p>Despite all these problems, I still LIKE Google Voice, and continue to use it, despite its unreliability.  If I'm dealing with time-sensitive matters or financially sensitive ones, I just give out my non-IP phone number, to ensure that I at least get the calls, but my main want for Google Voice is to replace my regular number, so that I can change phones &#38; carriers at will, that doesn't really sit well either.