I have a tk102b GPS tracking device I am trying to setup. Hoping someone here has had experience with these.

When I turn it on the green light just flashes, approx every 0.1 seconds which according to the manual means the unit is being initialized.
I have tried texting the unit with begin123456 to start the setup but get no response, when I call it it goes straight to voice mail.
I am using a skinny sim. I did not set the sim up as data only because I figured the unit has to send/recieve text.
When I enter the imei number of the unit onto the skinny website it says it won't work, but I assumed this was not an accurate check as it is probably not recognized by the telcos as a phone anyway, I am not sure how imei number checkers work?