The FCC listing shows the alleged Xperia Z1s with model number Sony D5503, and notably, a codename: 'Amami'. Further, the FCC listing shows the alleged Xperia Z1s running few Android versions, with build numbers 14.2.A.0.144 and 14.2.A.0.78, which hint that the device will be based on Android 4.3 Jelly Bean and not Android 4.4 KitKat. Interestingly, this is the first time the alleged Xperia Z1s has been leaked with a codename.

The yet-to-be-announced Sony Xperia Z1s is rumoured to come with a 4.3-inch Triluminos HD (720x1280) display with X-Reality for Mobiles; a 2.2GHz quad-core Qualcomm MSM8974 processor; 2GB of RAM; 16GB of inbuilt storage that's further expandable up to 64GB via microSD card, and a 2300mAh battery with STAMINA mode. Further, the Xperia Z1s believed to be much like the Xperia Z1 f and Xperia Z1 in terms of optics, sporting the same 20.7-megapixel Exmor RS sensor alongside the BIONZ image processor engine and pulsed LED flash. In addition, like other Xperia Z smartphones, the Xperia Z1s is said to be waterproof and dust-proof.

In November, the rumoured Sony Xperia Z1s, the much-talked about international variant of the Xperia Z1 f, was pictured alongside the flagship smartphone, the Xperia Z1. In the picture, the Xperia Z1s looked like a smaller but otherwise identical copy of the Xperia Z1, which measures 144x74x8.5mm.

Sony launched the Xperia Z1 f, a mini-variant of the flagship Xperia Z1, in October in Japanese operator NTT DoCoMo's winter smartphone line-up.