Renunciation is defined with reference to your mental attitude towards possessions, not the presence or absence thereof. See, for example the 'Royal Sage' (Raja Rshi).
Not really. Detachment from love of material possessions doesn't imply having no material possessions. It implies a lack of a disordered love for them. The true test of hypocrisy would be to see how one of those monks responds when his phone gets stolen.
That is a Western view of things where spiritual and material realms are different. Dharmic religions consider the spiritual realm to be a superset of the material, not separate from it.
You're right, of course, but it's not binary (either you're attached or you're detached). Instead, the idea is to become attached to subtler (read: causing more lasting happiness) aspects of life, as a consequence of which one becomes detached from the grosser (read: causing more fleeting happiness) aspects. This moving in stages applies on physical, emotional and intellectual levels.
Jumping to absolute detachment is not really possible.
