Samsung says it will send a text message to all Galaxy Note 7 owners in the US, informing them that the phones will be forbidden on board US aircraft starting tomorrow.

Notifying Note 7 owners, who should really have replaced their phones by now, that the devices are banned from aircraft will be key — uninformed passengers who are told that they must choose between their smartphone or boarding their flight will likely be furious, and it will be up to airlines, the government, and Samsung to spread this information as widely as possible in the next 20 hours before the ban goes into effect.

A Samsung spokesperson had no details about what the notification will say, other than the messages will begin to go out today.