Why wouldn't incoming calls count?
Back around the time carriers started charging for incoming text messages, customers used the argument "well, where's the reject button" and customers would end up being charged when they had no control of receiving a text message. The carriers were pretty much forced to offer customers the option to disable all text messaging on an account. This doesn't apply for phone calls as a customer can simply choose not to answer the call.
I only recall one carrier in Canada ever including incoming calls on a $0/month plan (advertised as such, but in reality it did cost money becuase you had to top up to keep the account active). That plan was an old Wind Mobile plan.
Unless specifically advertised as included in the plan, all carriers in Canada charge incoming exactly the same as an outgoing call. In the past, carriers have offered unlimited incoming, but it was either as a paid add-on or was included as part of the price plan.
If you plan on receiving incoming calls on a regular basis, you're better off to switch to one of Public Mobile's unlimited calling plans (incoming and outgoing).
