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Note that many 5G smartphones in the local market do not support DNB's mmWave Band N257 (28GHz), whose small-cells (look like Fiber Internet routers) are mostly deployed in downtown city centers and high foot-traffic venues like mega shopping malls, mega office blocks, concert halls and sports stadiums. Band N257 can reach 3Gbps download speed.
....... IOW, many 5G smartphones only support DNB's Bands B28 (LTE 700MHz) and N78 (5G NR 3.5GHz) which can reach "only" 1Gbps or 1.2gbps.  ........

https://en.wikipedia.org/wiki/Digital_Nasional
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Band .Frequency .......... .......... .......... .......... ..... Frequency width .  Protocol . Notes
28  ... 700 MHz (703-743, 758-798)  .......... ........ 2x 20 MHz
.......... .......... .......... ......... ......... ......... ......... ...... 2 x 20 MHz. .... .... LTE
78  ... 3.5 GHz (3410.4 MHz and 3511.2 MHz)  .. 200 MHz  ... ........ 5G NR .... Govt assigned 200 MHz to DNB
257 .. 28 GHz  ........................ .......... .......... ......... ......... ............ ........5G NR .... Govt assigned 1600 MHz to DNB

https://encikkunci.wordpress.com/2021/04/14...ed-end-of-2021/ - 2021/04/14/5g-bands-that-are-going-to-be-used-in-malaysia-expected-end-of-2021
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Yes yo.! .......

https://www.youtube.com/watch?v=WFJYeR2wpWA - 11 months ago New York = 2.6Gbps download speed.
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In Japan, many latest Samsung Galaxy high-end 5G phones support Band N257 (28GHz). Is this the same for Malaysia.? .......

https://www.au.com/english/support/contract...atible-network/ - List of Supported Frequency Bands for au Mobile Phones and Devices
The following is a list of supported frequency bands for each model.

Displayed according to manufacturer (listed alphabetically) and model release date. ...
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i'm using the Zyxel on Yes 5G flexi so far speed is ok but its wifi not as good as my old TPlink router

i didn't try LAN..... i find the LAN connection is slower than wireless..... i connect my TV via wifi is much better than LAN.... i tot LAN is always better ....but not the case with Deco router.... so i unplug all..