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Asus ROG Phone 5S connectivity issues to GSM networks

Ixonblitz
Star II
Please tell us some basic information before asking for help:
Model Name:Asus Rog Phone 5S ZS676KS
Firmware Version: Android 12
Rooted or not: No
Frequency of Occurrence: Constantly
APP Name & APP Version (If your issue relates to the app):N/A
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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Alright guys, I have bought myself an Asus ROG Phone 5s ZS676KS and it works great in hardware sense except for connectivity to GSM networks in the US. I can verify that the phone is the issue as I have tried on multiple GSM networks with no avail. I am now on Tmobile which besides Verizon(CDMA) has the best connectivity in my area. I have learned that other people on other phones with Tmobile often have service even if I don't. Me being a young IT guy have looked into the Mobile Data settings to find that the APN Settings were correct and even after doing all basic troubleshooting to eliminate all simple issues. The Manually select network option allows me to see all the available network and often the Strengths do not match others as if my phone is inaccurate and even if it shows up it doesn't seem to keep connected or connect at all. The speeds are slower and it does not seem to work like other US phones do. I have a few beliefs that could be true. I believe that there are other technologies used in Europe and Russia that the phone has built in because it is not typically on American Networks and that it is causing issues connecting/staying connected. I also believe that the way that the phone switched from one tower to the next is also different(and not working) so if I move out of range of 1 tower that the connection does not reset to the next tower but just disconnects. I have not been able to use adb to debug and read the logs and try and see if there are errors that the phone does not tell me. Although I have seen other discussions showing similar issues with certain parts of my issue but mine seems to cover a broad list of issues.
10 REPLIES 10

FunBike31
Community Legend I
these are wave emission values received by the human body, potentially harmful if they are too high, several organizations USA, Europe, India, Asia have defined values not to be exceeded when telephones near the ear , on the arm and on the hip, (the values are not comparable between countries), more explanations in the links below.
In addition
The maximum values are measured in the worst conditions, the telephone of an urban user will not reach these values and will consume less battery than a rural one with distant antennas.
The values do not reflect the listening quality, but obviously a telephone with a low SAR and an excellent telephone quality is a telephone with high quality antennas and a top internal design.
https://www.fcc.gov/consumers/guides/specific-absorption-rate-sar-cell-phones-what-it-means-you
https://www.scienceabc.com/innovation/what-is-sar.html
https://emfacademy.com/lowest-radiation-cell-phones/