You can look at the stream (RTP) information on the phone for an ongoing call to see what codec is in use.
In general there are no big differences between various phone models and the codecs they can support. However for newer codecs, like Opus, there are a distinct difference as this has to be supported by the phone model and older models of phones doesn’t usually do that. What codec the phone supports should be stated in documentation for each model. The recommendation would be to look through this.