I have a suggestion so people who are security freaks don't panic about it.
You can always have them turn the phone off for you. In a non transparent plastic bag you seal after they turn it off.
When they come to show you that they hadn't broken the seal you provide them with the badge.
https://www.youtube.com/watch?v=cQzyWXPyn3A
Seals, stickers, etc. are mild deterrents, not a shortcut for security.
I have a suggestion so people who are security freaks don't panic about it.
You can always have them turn the phone off for you. In a non transparent plastic bag you seal after they turn it off.
When they come to show you that they hadn't broken the seal you provide them with the badge.