Sony might be working on a Wi-Fi only variant of its Xperia Z Ultra phablet, suggests a FCC sighting.

Phonearena reported the sighting first and notes that a device dubbed Sony TS-0010 has been spotted at the FCC, where the device is defined as both a 'portable handset' and a 'portable UMPC mini-tablet'.

Further the FCC listing reveals that the alleged Sony TS-0010 boasts similar dimensions to the Xperia Z Ultra phablet, hinting that the Japanese maker might be working on a new variant of the phablet. The FCC listing also reveals that the alleged device does not support cellular connectivity and instead includes options like Wi-Fi with 802.11a/b/g/n/ac standard, Bluetooth 4.0 (Bluetooth Low Energy), NFC and GPS. The FCC listing also shows a 2.4GHz processor with bands 5.xGHz. Unfortunately, the FCC listing does not shed much light on the innards of the device like RAM, inbuilt storage, camera, battery.

The Sony Xperia Z Ultra was launched in July this year and is the biggest-ever smartphone in Sony's portfolio.

The Sony Xperia Z Ultra sports a sleek look with a thickness of 6.5mm, and weighs 212 grams. It features a 6.4-inch full-HD display with a resolution of 1080x1920 pixels. It is the first smartphone display that integrates Sony's Triluminos technology, which the company introduced at CES with its Bravia televisions. The device includes LTE, NFC, Wi-Fi, 3G, DLNA and Bluetooth connectivity options. The Xperia Z Ultra is powered by a 2.2GHz quad-core Qualcomm Snapdragon 800 processor coupled with 2GB of RAM. It offers 16GB of internal storage that can be expanded up to 64GB via microSD card.