The Mobley device that I ordered last week showed up less than 48 hours after I ordered it online, complete with a phone number to call to activate it. I called the number and was bounced from one person to a second one who informed me that the sim card in the device was defective and that I'd need to take the Mobley to an AT&T store (store number two from the previous post) to get the sim changed. I was fortunate enough to get the same fellow that had been able to find information on my desired plan when I was there before. He quickly had a new sim in the device and had it fired up. Added the Connected Car Unlimited Data Plan (standalone) to my account and I was out the door within 15 minutes.
Yes, it was a bunch of hoop jumping, but yes, I'm very pleased with the Mobley. Good (not great - it's a generation behind) performance and another data source to spread out our load.