You will not 1,72Go free 4GB, and yes a ton of native application are non-reducible. So yes, there are SD, yes but no. The smartphone is android 4.4.2 (kitkat) impossible to migrate native apps on SD card (thank you Google) as is so that if you update them, you'll end up with 300MB free, what becomes very problematic especially if you have not started by maj firmware.
So if you are applitovore, you will end quickly stuck if you just want a smartphone to take advantage of 4G to surf or switch to wifi access point with your tablet, it fulfills its role very well.