I'm not going to give my phone
Are you sure about not giving your phone? Why does someone want to have your phone?
I never want to give my phone and I hate people who still do that.
Your phone is something very personal to you. You shouldn't have to give your phone away just because someone wants it.
I'm working on a secret project on my phone. I can't give it just like that.
I think you have the right to make this decision. Your phone is in your own control.