again...
There are power saving thinks who can be adjust to let the phone sleep the most time and not consume much energy. With a conventional Hotpot where this Option are not exist in the public you cant tweak the Hottspot to be that power efficient. Sure with "other brands" who are not certified you maybe get the same results if you have the same options but if it not work the will say: "fuck you".
Now I could make a complain to fix that problem. Zyxel send me a custom FW over who 2 Settings could be change who are not changeable for the default FW and who are needed.
Like others I have no idea what you're on about. This is a problem apparently none of us, or the other millions of people around, have. Perhaps fill us in on your phone and what 'certification' is needed.
is not used anymore in modern MIMO AP's.
I dont know if the use MIMO or not.
The year is 2020. They use MIMO. When we say they use MIMO, you should probably listen.
You are chasing the wrong problem - either your AP is junk (seems semi-likely, it is consumer gear) or your phone is junk (also likely). Messing around with putting the wrong antennas on a device is not the solution to whatever problem you're having.