There are hardly any reports of FP2 phones in Japan on the forum. However for the FP1, you can find some experiences in this topic, which indicates that dual SIM is not working because there are no supported 2G networks.
There are hardly any reports of FP2 phones in Japan on the forum. However for the FP1, you can find some experiences in this topic, which indicates that dual SIM is not working because there are no supported 2G networks.