iPhone 5S AU Japan – no service rsim10+


I once unlocked an IPhone 4S softbank successfully with the rsim 10+.
Now I tried a 5S AU, it worked 10 min. until I tried to make a call. Since then,
There’s no service any more whatever I tried. I’m using a German SIM card in that case, but I’m in Japan. Not sure if roaming makes it more difficult.

Thanks for your help!