BLU Products one of the leading unlocked smartphone seller in the United States has launch all new BLU Advance A4 2019 mobile phone powered by Android operating system. Price at $40 it has a lot to offer, in fact it's the cheapest unlock Android mobile phone. The BLU Advance A4 2019 is successor to Advance A4 mobile and comes with improved features. Going through BLU Advance A4 2019 specifications this latest BLU phone comes with 4 inch display and runs on Android 8.1 Oreo Go edition version. The BLU Vivo Go is also a Android go mobile phone but its priced at 80 dollars. Under the hood, the 2019 variant of Advance A4 comes with quad core processor couple with Mali 400 GPU with 512 MB RAM and 16 GB inbuilt storage. That an increment in storage from 8 GB in its predecessor. Also Read: Sony Xperia L4 BLU Vivo X6 specifications Galaxy S20 Android 11 update Bitcoin Transactions Per Second In terms of camera, Advance A4 2019 has a 5 megapixel camera on the rear side and a 2\u00a0 megapixel camera on front facing side. A 1400 mAh Lithium ion battery keep the device ticking on. Sadly it doesn't include 4G LTE connectivity as you have to deal with 3G 850\/1700\/1900 and this mobile will work with all the GSM networks in USA and most countries except the CDMA networks.