ASUS ROG phone 6 256gb 4G+ speeds slow

[BTTman]

Please tell us some basic information before asking for help:
Model Name: Asus ROG phone 6 256gb
Firmware Version: WW_32.2810.2209.197
Rooted or not: Not rooted
Frequency of Occurrence: happens all the time
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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I just got new sim card and my old phone s20 ultra beats this phone mobile network speeds by huge marginal!

I have tried to same server for each phone and s20 ultra got nearly 3 times better score with this sim card. Is there something I could do to improve result. Even YouTube struggles to work on mobile network
Also my old sim card worked fine with this phone but not this new one..

[ASUS_Bot]

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