not compatible with network update 2020-12-22 19:51:29 This is somewhat off-topic but does have an audio connection. Maybe someone here knows enough to provide information. Maybe someone knows of a smartphone forum or other site that is likely to have more information. I tried a couple of smartphone forums turned up with a general web search and neither worked properly. I could register but not get much further, let along get and information.My htc one phone is 4G LTE, which supposedly means it should still work properly with the network changes being done to accommodate 5G. One day voice mail was normal, starting the next day I receive what seems to be a busy signal when I called it. After several days of this I contacted my carrier’s support. After half an hour or so of trying to “reset” voice mail for my account, I was told my phone was not compatible with the latest network upgrade.I ask why? And how could I know if another phone would work? (aside from the new 5G ones. I have no need for 5G and certainly cannot afford the 5G phones being offered.) I was told my phone is not HD complaint and that is why it cannot connect with voice mail.I found an article which proposed to tell readers what HD voice complaint means. It explained various thing about audio quality but also said it would be difficult to find a smartphone that was not HD complaint “these days”. The article was written in 2012.The copyright date on the htc one’s user manual is 2014, which maybe means the phone was made in 2014 or later. In the phone’s Settings, to turn either On or OFF, is something labeled “Beats Audio”. It isn’t mentioned in the user manual but I am guessing it has to do with audio quality for people who play music on their phone. Either On of Off makes no difference in (not) reaching voice mail.I hope to get a refurbished phone, if I truly need a new phone. Anyway, is “not HD voice complaint” a reasonable explanation of why the phone can’t connect to voice mail but otherwise seems ok?Looking at a few phone ads, with descriptions of why someone might want to buy the phone, I see no mention of this characteristic so how can I tell if I am buying a useful phone, assuming HD voice complaint is really relevant?