A game of cat and mouse if the perfect analogy, especially if the cat holds it against you when you don't come running when it miaows and uses it as an excuse to cut your cheese allowance!

On the one hand HR is all 'don't answer your personal phone if a manager calls you on it' but managers are like 'where are you? you didn't answer your phone?!'.

Then, if you complain there's the danger that you'll be 'awarded the status' of having a company phone. It's a minefield...