Check Out World's Thinnest Phone By Japan

A 5.3mm (0.2in) thick 4G phone has been announced by Japan's biggest telecoms firm NTT Docomo.

The compact device, which will be released in Japan next month, is designed to fit inside a card holder.

It is part of a trend to offer so-called companion mobile devices to those who already own larger smartphones.

The phone weighs 47g (1.6oz) and features an electronic-paper touchscreen, similar to e-books.

It will have limited functionality, with calls, texts and a net connection but no camera or facility to work with mobile apps.

The phone, dubbed Card Keitai KY-01L will be made by electronics firm Kyocera.

NTT Docomo describes the mobile as the "world's thinnest" but that claim is likely to be disputed by other phone makers.