Sony's upcoming Xperia Z4 smartphone may have just received the necessary certification from Postel, the Indonesian authority that deals with such things. Three Sony phone models have been given the all clear by Postel, one of which could in fact be the Xperia Z4. The Indonesian authority has only given us the devices' model numbers, but we can make some assumptions based on them. So let's start with the E6533. Last year's Xperia Z2 had the model number D65xx, while the Xperia Z3 was D66xx. The letter used has to do with the year of release - so "E" is right on track for 2015, "D" was for last year, and "C" for 2013. If Sony keeps its naming scheme for the model numbers intact, and there's no reason why it shouldn't, then the E6533 could very well be the Xperia Z4. Joining it in the Japanese company's portfolio at some point during this year will be the E5333, as well as the E2353. The latter will obviously be the lowest-end of them all, and could actually serve as the successor to the Xperia M2 (which is the D23xx). The E5333 looks like a midranger by its model number, though exactly which handset it's supposed to replace in Sony's roster isn't clear. The closest older device to its model number is the Xperia T2 Ultra phablet, but that doesn't necessarily mean that this one will have a big screen too. As for the Z4, if it has started its certification tour already then it should become official sooner, rather than...
Source: http://www.gsmarena.com/xperia_z4_gets_indonesian_certification_launch_not_far_away-news-10986.php
