It is little more than three months since Sony released its latest compact phone, but leaks have suggested that the Japanese firm may already be working on the smaller version of its flagship Sony Xperia Z2.
The Sony Xperia Z1 Compact went on general release in the UK following the Consumer Electronics Show (CES) in January, but the Federal Communications Commission (FCC) in the US has already been passed what is believed to be its successor for approval.
The previous phone went by the name SO-02F before its release earlier this year, and the FCC listings state that it has been given a new model by the name of SO-04F, with rumours now spreading that it is a Japanese version of a newer phone, the Sony Xperia Z2 Compact.
In the listings, it can be seen that the new model is slightly larger than its rumoured predecessor, with a 127.6mm x 65.5mm body hosting a 4.5 inch screen.
This compares to the Sony Xperia Z1 Compact, which was hosting a 4.3-inch 720p display.
As of yet, no other specifications for the phone have been released, but any advancement in model would be likely to come with a step up in specifications, it is believed.
The previous handset was pitched to the higher end of the market, and was home to a 2.2GHz quad-core processor, 2GB of RAM and a 20-megapixel camera, so if Sony has decided to upgrade this hardware, then it is likely that many will be looking to trade in their phones to take on the new model.
Sony has already built itself a reputation for releasing phones in the downgraded bracket that are as close to their more powerful siblings as possible. The Sony Xperia Z1 Compact was built for those who wanted all the power of a flagship device but without having to deal with a five-inch screen, which is simply too big for some consumers.
And it wouldn't be the first time that the company had upstaged one of its own new phones just months after releasing it.
The newest flagship, the Sony Xperia Z2, was first launched back in February, just five months after its predecessor, the Sony Xperia Z1, came to market.