I don’t know if the same mapping can be done in case of xperia 10 III - I doubt that, but maybe someone else can shed some light on it . Nevertheless I suggest you to enable volte explicitly - if you haven’t done it already. It is done by sending SMS message ‘WlaczVoLTE’ to number 2601 (for postpaid) or by shord code *101*11*1317# (for prepaid).
Both xperia 10 II and III are not officialy volte supported phones by polkomtel according to their website. Xperia 10 II works with volte, so chances are the 10 III may also work.