From PCCW Hello Card Point 12
No local airtime charges applied for Unconditional Call Forwarding Package. Local call forwarding when busy, unanswered and unreachable are not included in the package. The package will be renewed automatically every 30 days and related package charge will be deducted from your account.
It does not mean if I enable Unconditional Call forwarding, then $2 will be waived wor.