Today I was finally successful in getting AT&T to add the RF-V16 locater added to my AT&T Mobileshare account for $10/month. Before today, it was listed as generic Smartphone for $15/month, same as I pay for the iPhone 6'es on the same account. The RF-V16 requires both a data and a voice plan (because you can call it and make it ring), but it operates as a GPS tracker, just like the Amber Alert tracker they sell for $100, plus a 2 year contract (my RF-V16 was $40 from an eBay seller). It was a struggle, but AT&T agreed that a GPS tracker should be $10/mo and no activation fee. They had to insert a fake IMEI instead of the one on the unit, to make their system recognize it as a tracker, and not a phone. It looks like the change actually took the rate, but it remains to be seen if they reversed the $40 activation. $10/mo might not be the cheapest service, but it just appears as a line on the cell bill I already get, I can turn it off whenever I want, so it turns out to be very easy and convenient. Plus AT&T works nearly everywhere. No charge for the SIM card and phone number, and no activation fee (hopefully). I am a big fan of the device. about an inch square and 27g. Plus it has a speakerphone on board. Besides all the GPS position related information exchanged by sending text messages to it, you can send it a command to place it in auto answer. Then call it, and see what it really sounds like at altitude! (not worth much, but bragging rights to your friends).