The Galaxy Mega is only slightly smaller than Google's 7in Nexus tablet
Samsung has unveiled the biggest smartphone to date - the Galaxy Mega, which features a 6.3in (16cm) screen.
The firm suggested its size made it ideal for watching videos or running two apps alongside each other.
Samsung helped popularise the so-called "phablet" category - in which phones approach tablet dimensions - with its original 5.3in Galaxy Note in 2011.
That proved more popular than many expected, but one analyst suggested the latest device might be a step too far.
Samsung is marketing the Android-powered handset as having a high-definition screen - however, a spokesman was unable to confirm whether it supported 720p or the "full HD" 1080p resolution.
Another South Korean firm, Pantech, currently lays claim to offering the biggest "full HD" smartphone with its 5.9in Vega No 6 which was announced in January.
China's Huawei had previously boasted having the biggest largest-screened 720p smartphone with its 6.1in Ascend Mate.
Samsung also makes the Galaxy Note 8.0. Some versions of this 8in-screened device feature an HSPA+ radio allowing them to make calls, but the machine is being promoted as a tablet with phone functionality rather than the other way round.