You shouldn't even have to ask .
Any top provider should know on her own that she should turn off her cell phone during a session .

your donations have nothing to do with her cell phone .
There is no reason to be interrupted by her cell phone .Your time is YOUR time and you should not be interrupted .

I always have my phone off during a session .It is the clients that sometimes have their phones on ...........but that is on them .

Enjoy your Vegas visit ,
xoxo CindySpice

This is your time.  You paid for it and deserve full attention. Most of the successful high end providers always turn off their phones.  If they refuse or interrupt my session with phone nonsense, I won't see them again.

I always turn my cell phone off it can get really annoying!! so don't worry.

Lots of naughtiness for you soon
Kadi

If you are paying for her time, you should have her undivided anttention no matter what the price. Any provider who has a problem with that is unprofessional. It's your right to insist she at least put her phone on vibrate or silent and not answer it when she is with you.

I am always turning it off for appointments and no one can reach me by phone because of it.

but that won't stop them from leaving it on and ruining whatever mood you were in.  Usually happens with the clockwatchers since they don't like to watch the clock but someone will call them and let them know the time is almost up or already over.

Bob