A Fujitsu F-series flip phone, popular for use as a so-called "Infidelity Phone."
Keeping an affair secret can be a lot of work, but Japanese philanderers have a hand up thanks to a stealthy flip phone only sold in that country.
The Fujitsu “F-Series" phone has a band of loyal users who have refused to upgrade to smart phones for fear their cheating ways be exposed,
The phone even has a nickname, "uwaki keitai" or the "infidelity phone.”