On 9 Nov 2023 SIMBA published the latest Roaming Partner list, SIMBA added two new operators which offer both VoLTE Roaming and 5G for both New Zealand and South Korea.

VoLTE and 5G Supported

CountryTelco
FinlandElisa
Hong KongHutchison
DenmarkNuuday (TDC)
MalaysiaCelcom
New Zealand Spark
ThailandDTAC
PhilippinesSmart Communications
South KoreaSK Telecom
USAVerizon