For me on Xperia 10 III (62.0.A.3.109) it can’t even register.
Without config changes or even with: VoLTE on the Xperia 10 II - filling in the gaps - #57 by JacekJagosz
Registered: ✕ - fixed that with help from archon: VoLTE on the Xperia 10 II - filling in the gaps - #58 by archon
Country: PL
Provider: Polkomtel
Device model: 10 III
Registered: ✓
Voice in: ✓
Voice out: ✓
SMS in: ✓
SMS out: ✓
**** Requires modem.conf mapping. (only on X10II?)
And also requires sending an SMS to activate VoLTE service, as archon said.