http://srqzezgrcqbequac733i3fej7d2cymzdiy5biie46tpib3ii7mfxfcad.onion/current.php
The only thing you have to do is walk past the second device from time to time so that the data is transferred to the cell phone. (You could also connect the 2nd device to the internet but it would be bad if it is found and it has a sim card. Or you could take the 2nd device, make a few more and hide them near each other. so that the data is then transferred from one device to the next so that you can then pick up the data at another location by walking past).