SG 135 with LTE - Extremly slow

Hello Community,

I have a massiv problem with my SG 135 in combination with the 3G / 4G LTE module (for 125/135 (W) rev.3 only.) 
The internet is simply not usable with this LTE Modul. It varies between 1Mbits and 30Mbits. 

A cheap Huawei router with the same Sim Card / APN Settings getting easy 150/60 Mbits.
What I find's really strange, that I can select under Typ only 3G / UTMS, although the data sheets speak clearly of 4G.
Is there a mistake on my side, or have I not considered something?

 

I hope you can help me.Sorry for the bad english.

 

Greetz