Please tell us some basic information before asking for help:
Model Name: Zenfone 7 (ZS670KS)
Firmware Version: 29.14.53.23
Rooted or not: no
Frequency of Occurrence: constant
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 am using Cricket (subsidiary network of ATT) and they require VoLTE enabled phones. I see the 4G bands are compatible, however I am unable to enable VoLTE in the settings or by using the *#*#4636#*#* , as the option is greyed out. Any recommendations?
