Check your AT DSL line for VDSL compatibility using this script, put your phone in the cfg and run it. it will periodically run for checks every 24 hours, you are free to edit the script to increase the frequency of checks but be wary of ip bans or rate limiting over the api.
This script has no POC as the backend of the company could be malfunctioning or poorly maintained showing inconsistent results.
The development of this script was made solely for the purpose of education only.