[FalconSensei]

But if the phone doesn't come with a card pre-installed, people are going to complain that it doesn't work, or that they didn't know they had to purchase a card.

Unless it comes with a card, but the card is not inserted, so the user has to do it before booting up the phone

[hutzlibu]

Or, provide a simple and clear way, to move all the user data to the card, first time it is inserted.

[catlikesshrimp]

Sounds alright that people complain about not knowing about external storage. They will be educated at that point.

This sounds like something that can only be mandated. It doesn't make much from a business point of view.