Maybe nobody cares about this but me but I got to wondering. Since I have my Google Voice set to pass through to me the Caller ID of the caller, does AT&T Wireless think that the incoming call is really mobile-to-mobile?
YES!
Here's my Google Voice setting relative to incoming Caller ID.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiah7Z2pgQzbtzY_poCop-RyMMtf3VsFcAHs1_h3EkpVf_Sr0TxWU-y2sVb0TlnOxOTMI7LPld8pAPtjLAN3VTpD2y95krjm6t10ge21NI5ywXhcT8_qTKe5CPxPm30QXJjSyPq/s400/M2M0.JPG)
Here's the entry in the Google Voice History for an incoming call from an AT&T mobile.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiaeUT54IEB6kXpm1OVlVUw5Ah9IxQKk2LxmWilhaM15f3qj-u1BXJSxA7Q0iqmA7qtiuXUC0GdEgNa41Xy1_AhzsmeAcCNv03vOZ2gbb-aFKUskrjUYKeYdHwk1DTyZRF3FFlk/s400/M2M1.JPG)
Then here's the entry in the AT&T call log showing a matching number, time, and duration and indicating it was "M2MCNG."
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg_zhV9VghxJOcjl7FxE5qaffUP9hYlRWPhS079zpUHv2LIjHBqKm1nRz-mKcl_5jatuzMsvf_d4TTr85T8wWZGTR5Kvdx1sPu46dgOS_qM_nTvXKlTkoNT40wM2j1Mq5C9jpfc/s400/M2M2.JPG)
Just to close the loop, here is AT&T's definition of "M2MCNG."
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgpTtqgIRZP-kE0i5UXPIEPdL8TCxeeItT1gmGOQqY11HbvHtjCKMLIfU562tZWQO8TuQd8Os_mIF0BRJq21N3C1YxRBUjafVQF7K5hJkJwwoSPZcQmML7IBLZ2COOSUHohJH8a/s400/M2M3.JPG)
What this means is that you can share your Google Voice number with everyone. If someone then calls your Google Voice number with an AT&T mobile phone and you answer it on your AT&T mobile phone that call will be counted as mobile-to-mobile, i.e. free.
If you're not an AT&T Wireless customer, your mileage may vary. Try it and post your results in the comments.
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