It is an incoming version of a message bottle. Receiving incoming manufacturer.
Someone in the world will receive your incoming call. You can also send it.
Since it is only an in-app incoming call, you only enjoy enjoying incoming calls without responding, so you do not have to do anything anything and you can enjoy only interesting parts by anyone.
I think that you can enjoy not only bottle mail, but also those who like bottle letters and fake phones, fake calls and messages funny sentence competitions.
Music is VFR