If your employer informs you that your private smartphone is going to be tracked and monitored due to security reasons - is it OK for you?

• No. My privacy has to be respected!

I  don't think i mind them tracking my phone. as long as its not boring for them to just follow an average guy. but i will mind if any information obtained through the process is used in any kind of form for other purposes other than security reasons. Those terms have to clearly be defined and there must be grounds for transparency or trusted third party other than the employer directly.

my answer would be letter C,

I'll suggest to have an extra phone for working purposes only.

Switch off your mobile phone while in office.

only if i have agreed to that on my contract.  depends where you work and if that need to be done on that site