EC25J VoLTE compatible firmware version

I am aware that EC25J is compatible with VoLTE, but there was information that there is a version of EC25 that is not compatible. We’d like to get a Japanese model that supports VoLTE. Please let me know the firmware version, etc to specify the VoLTE version.
Best Regards.

Hello, I have checked various models of EC25J, and they all support VOLTE at present. Welcome to choose the products of Quectel.

Thank you for your support.