Please carry your cell phone with you (with the power on) while you are at  work during normal business hours.
It is important that I can reach you when  it becomes necessary.
Thank you for your cooperation.

Cellular Phones
Please carry your cell phone with you (with the power on) while you are at work during normal business hours.
It is important that I can reach you when it becomes necessary.
Thank you for your cooperation.
necessary thank cooperation normal business hours important reach carry cell phone power work