For incalls, real phone, wallet ect locked in car. All I have in my pockets is car keys and fee. Assuming I'm driving of course, have had a couple where I've been out and about doing other stuff and had a punt to kill time, main phone switched off before getting to the door, unlikely to be a risky punt. I tend to stick to this as best practice even with escorts I've seen multiple times and know it would be safe to take things with me, just so that it remains routine.
For an outcall, I'd obviously have all in the room but main phone would be switched off prior to the SP arriving,if in a hotel with a roomsafe, keys wallet and main phone would be locked away in there (along with anything else that could provide my real identity).