For a while, i tough 4g and LTE is just the same. In fact it was different. Sony devices says LTE in the signal bar here, but the other phone was just 4g.
It was no use to record everything in 4k. Recording your friend sleeping in 4k? No. Recording your doughter mariage in 4k? Absolutely yes. But it's all depend on you. You may take more time just to save your 4k vid's on the cloud. Just my opinion.
It wasn't screen protector. I bought huawei y6 last month and it have no screen guard installed. Just buy a screen protector just to avoid unwanted scratch in your y3 screen.