Your line needs to be:
"It is inappropriate for me to store or access company data on my personal device. If you want me to be reachable outside of the office other than through phone or text, I will need a company device."
Your line needs to be:
"It is inappropriate for me to store or access company data on my personal device. If you want me to be reachable outside of the office other than through phone or text, I will need a company device."