EC25J's compatibility with Rakuten Mobile

Please tell me the technical differences between the EC25J (EC25J) FW compatible with Rakuten Mobile and the FW for DoCoMo, KDDI, and SoftBank. (I would like to know why they cannot be used together.)

hi ,
Please provide the specific firmware version and what issue you are experiencing

We have received questions from customers who want to use Rakuten Mobile SIM cards with standard FW (for DoCoMo, KDDI, Softbank) asking why they cannot share the same SIM card.
We have answered that it is for technical reasons, but if you could provide more details, that would be helpful.

The new firmware version is now compatible with all operators.

OK,Could you please tell me the compatible firmware revision number?

Firmware revision number: EC25JFAR06M4G_01.007.01.007.

Thank you for the information.