Flip Phones Keep Japanese Wives from Flipping Out

Japanese philanderers know their weak spot: the smartphone. 

Afraid that girlfriends and wives will spot incoming calls from certain secret someones, Lotharios in Japan are sticking with Fujitsu's old "F-Series" flip phones, the Wall Street Journal reports. 

The so-called "infidelity phones" can easily be programmed to conceal calls and texts from particular contacts.

Fujitsu has added similar privacy features to its new lineup. Like the F-Series, these phones signal users with little changes of the antenna or battery mark. Only problem: they require a separate app. 

US entrepreneur Neal Desai has designed a similar app called Call and Text Eraser that's been downloaded more than 10,000 times—but he cooed when told about the F-Series: "That's more genius than my app," he said. (more)