best way to get 4g lte on smart is to buy a huawei lte modem/router. Not through phone. If using an LTE router, force network to LTE mode only.
I learned this from using an LTE router. Ayala area will have 4g signal mostly on the terraces side. The signal will come from the PLDT office in Mabolo. Inside quest hotel itself there is also smart lte but only INSIDE... Along Gorordo you will also get a signal from Golden Peak area to KIA area. Hinay but not bad. Around 5-8mbps there. Talamban has good chance for full lte. Tried in Maria Luisa Park behind USC Talamban, naka 4 bars at 21mbps.