Default Not able to change to 4g LTE

Hey guys, I have a bit of problem with my network settings. I've just received a mail from my telecom that says that I'll be able to use 4g now (finally!). But I can't change my settings to support that for some reason... I'm able to chose GSM/WCDMA auto, WCDMA and GSM but not LTE to support 4g.

What can I do about this?