Well, it wasn't sufficiently clear because when CBSA was asked for examples of what might be found on cellphones, they used examples like propaganda, which strikes me as actually very important for border security officials at airports. So it's still not clear to me for that reason.
Another example they used was in relation to child pornography, which should be of concern to all Canadians whether someone is crossing at the border or at an airport. They didn't actually give great indications of what they might find on a cellphone, other than a receipt perhaps. It's curious to me that searching cellphones for a receipt seems like a very unimportant thing when privacy in a cellphone is so very important.