The phones are now banned on all U.S. flights.

This comes after more than 100 incidents in which batteries overheated, causing spontaneous combustion.

As travelers checked their bags at the airport, customer service agents were asking them if they had a Galaxy Note 7. And if they do, they needed to take it back to their car -- or it could be confiscated.

That announcement is similar to the one people heading to Milwaukee heard before boarding their Saturday flights.

"There are those that could not bring their Note 7s on the plane, and if they didn't want to leave it behind, they couldn't get on the plane," said Rachel Larsen.

At Mitchell International, there are no signs to tell people that the devices are banned.

"I knew that there was stuff going wrong with them but I didn't know there was any ban from the airport or anything like that," Jake DeWitt said.

The move comes after 2.5 million of the Samsung smartphones were recalled due to what the company called a battery manufacturing error. Some devices have spontaneously combusted after overheating.

"(It's) just, you know, random that they explode or something," DeWitt said. "So I think it's a safe precaution."

The best advice people are getting at the airport is leave the phone at home. The ban on the Samsung Note 7 is in place until further notice.