4 inch sounds like too small to look at for your parents, how about 4.5 inch ~ 5 inch?
Yes. Huawei are "taikor" of making telecommunication/networking equipment after talking over the Ericsson.

YES 4G LTE Compatible List: https://www.yes.my/supported-devices

So probably best bang for bucks is Xiaomi Redmi Note 3 Pro, if Huawei, look for Huawei Honor 5X.

Here is some filtered list of Band 38 + 40: http://www.gsmarena.com/results.php3?nYear...idTouchscreen=1

Thanks sifu, my oneplus one auto dead again, going chg soon

1. Will 32GB of Mi5 enough for your usage? It was non-expandable by MicroSDCard. OnePlus One was 64GB.

2. Buy from Huawei MY is better than AP sets of Huawei, because Huawei MY offer glass break warranty. AP don't.

Then go for Mi5. Bear in mind the back are Glass.