no, i mean run the 12V power lead from the leisure battery
cut the end of this, add it to the connection on the leisure battery ( so it doesnt stand out )
https://www.ebay.co.uk/itm/Car-12v-P...QAAOSwstxU~GTY
then hide the ciggie lighter end and a phone in a hidden place
If you were worried about someone tracing the cable, you could add one of these close to it so they thought it was heading to that
https://www.ebay.co.uk/itm/Campervan...YAAOSw5UFb~q0s
Infact if you were that way inclined, you could even cut a hole behind that fake socket ( above ) and hide the lot behind that
dont forget you need to use the phone every few months on a Pay as you go sim to keep it active, so you need to be able to get to the phone