CNBLUE's Yonghwa revealed how idols exchange their numbers these days.

On the September 16th episode of KBS 2TV's 'Mr. House Husband 2', Yonghwa appeared as a guest and shared his daily life. He recently moved to a new place but the remodeling process is taking longer than the initial plans, so he shared that he has been moving around. He then went to groupmate Jungshin's house and shared a meal together. 

While they walked down memory lane together, Yonghwa shared how the new generation of idols has a different method of exchanging their numbers these days. "This is what I heard recently. So when male and female idols happen to be in the same salon, they exchange numbers via airdrop. They simply airdrop a picture with their name and number on it." Yonghwa then proceeded to tell surprised Jungshin to turn on the airdrop and Jungshin laughed it off, "No one sends such things to me."

The relevant segment starts around the 10:50 mark in the video below.