If they are going to enable calling, I sincerely hope they learn from the current phone spam and email spam mess and don't let just anyone call you at any time.

If they are going to enable calling, I sincerely hope they learn from the current phone spam and email spam mess and don't let just anyone call you at any time. Ideally, you could authorize people to call you by giving each person/entity a different token that authorizes them to call you. Then if that person/entity sells the token to 3rd parties, you not only know who sold you out, but also you have the ability to revoke that token easily.