Almost 20 months ago I ported my number from Verizon to Google Voice, bought a Galaxy Nexus, and activated it on Straight Talk (I've since switched to AT&T Go Phone). I told no one, and used my Google Voice number as my only number. Immediately I noticed the latency on voice calls, resulting in lots of me talking over the other party, or vice versa. During the 20 or so months of use, I've seen absolutely no improvement in this area. As a result, this morning I put in a port request to transfer my Google Voice number to AT&T. There have been other issues too, like: The crappy UI and pathetic attempt at threading GV conversations The inability to use Google Voice for quick responses when ignoring an incoming call (the API and permissions have existed in Android since 4.3) Lack of MMS support Incompatibility with some services (i.e. banks) that send texts to mobile numbers The concept of Google Voice is great - one number, forever and always. It made it very easy for me recently when I was testing out the Nexus 5 and Moto X - I could use either phone and no one knew I was changing phones on a (sometimes) daily basis. For those who primarily use data and texting, and make/receive few voice calls, it may not be a deal breaker, but for me the frustration of the voice latency far outweighs the benefits, even if all the other issues I listed are fixed. But... once my port is complete, I'll probably get another GV number for use as voicemail, and for exchanges for possible Craigslist buyers, or others don't want to give my real number to. In that case, the benefit of anonymity outweighs the downside of the latency.