After seeing the Xiaomi Redmi 3S Deals and a few others appearing on here recently I thought I would put in a phone that I have recently purchased [after doing a fair bit of research to find a dual-sim phone, with decent band-support, 5 inch screen and opportunity for software updates].
Doogee get a decent reputation for a Chinese brand (also responsible for the HomTom - http://www.doogee.cc)
and can be bought on amazon through various suppliers; they also support OTA updates.
This phone has decent phone-band support for 2G, 3G and 4G coverage in the UK and Europe (www.willmyphonework.net)
MTK6737 (new) Quadcore Processor
16GB ROM (expandable with MicroSD/TF Card)
4000mah battery for a couple of days use
5 Inch (720p) Screen
Available in Black or White
The camera is the weakpoint for this phone (5MP interpolated to 8MP front and back), no Gorilla Glass screen (although a $1 glass screen protector sorts that) and the robust looks due to the large battery.
IMO its one of the best (new - not 2015 release) low-priced phones. For this price, make sure you choose "EU Warehouse"