Update. I just received the phone it today.

No. For DiGi, it doesn't support 4G+. Signal bar only shows 4G only. Not sure for other telcos.

Note:
When you use the UMB codes (*128#,  etc...) the connection will switch to 3G for a while, same when making/receiving a call. I think this is same for most phone (my old phone does this, but I think VoLTE phones don't). Just sharing.
Can someone check if you restart the phone it doesn't need the startup password anymore before you can see the lockscreen?
In Mi A1 you have to unlock it first before it will show the lockscreen.

edit: Added note.