Historically, the perception of mobile operators in the eye of large multinationals has been variable, to say the least. Ad hoc feedback from some multinational corporations (MNCs), along with situations where requirements were fairly one-dimensional, might have pointed to adequate service, for example for simple voice …
No, but no operator is, whether mobile or otherwise
My experience with telcos of all stripes is that incompetence and apathy is the rule, not the exception, like the one cheerfully announcing it would take months to restore a $100K/month transatlantic T-3 circuit, circa 1999. I don't think any carrier is reliable enough for a multinational not to have redundant connectivity and contingency plans, whether voice or data, fixed or mobile.
The sole possible exception is SITA (now part of Orange Business Services), which was started specifically to address the airline industry in its far-flung geographical footprint.
How do moble operators in Canada compare?
Well, like our American cousins, they overcharge and under deliver. They have spotty service, crappy rural coverage, barely competent metro coverage, exorbitant data and texting rates, tragically inflexible plans and a gauntlet of lock ins.
Unlike our American cousins, because our regulators are so unbelievably toothless, when the operators decide it's your turn to be yanked into the back alley, they don't use any lube.