I activated my wife's Moto x with a nano SIM out of the kit just fine. Stupid question is did you set the apn settings? Maybe the SIM went bad. My kit was all messed up, I got two AT&T nano Sims and two tmo regular/micro Sims.
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"But WHY THE RUM??!!"
Motorola Atrix HD
With one custon rom or another.....