SUBSCRIPTION
Every cellular-enabled tracking device on the market has a monthly cost associated with it, even if it's hidden.  There are only 4 cellular network providers in the USA - Verizon, AT&T, Sprint and T-Mobile -  so if you have a cellular connection of any kind, one way or another, one of them is being paid for it.
 
I've tried to keep this price as low as possible.  Since I offer 2 months free, I will refund the first 2 months of the subscription  when it's shipped out to you.