[Q] SIII LTE on Softbank in Japan topic

Hello,

I got a Galaxy SIII GT-I9305 from my insister from France. Then Phone is branded Orange, is rooted it, change firmware 4.2 to 4.1 Orange, I removed the Simlock via the service mode.

I inserted my Softbank nano sim card (from IPhone 5) with an adapter. I used the following APN setting:
-APN: jpspir
-Username: sirobit
-Pass: amstkoi
-AuthType: PAP

I runned a Sppedtest and my result are really bad:
Ping 123 ms
Download 0.12 Mbps
Upload 1.77 Mbps

I know that the GT-I9305 use the 800, 1800, 2600 MHz LTE Band and the Softbank network works with 2100 MHz, but even with 3G or H+ it should be faster than this?

Did I miss something? Any idea, comment?

Thank you in advance!