I have received a very nonsense reply from Siymo (also an operator owned by Eplus and using their network) when asking why I cannot use LTE with my 5S on the Eplus network and why O2 customers (O2 owns now via Telefonica Eplus) instead can. And why as Simyo customer, I have to be treated as a "B" customer.
They claim with a very empty answer that the offers for the hardware lie in the area of responsability of the hardware manufacturer themselves. (????)
"simyo kann die Vertragskonditionen seiner Mitbewerber weder beeinflussen noch zeitnah Angebote zur Verfügung stellen, die im Verantwortungsbereich des Hardwareherstellers liegen. Wir bitten um Ihr Verständnis."
I have just now written back also making the point that Simyo (as well as Eplus) lie when they say that LTE is for "everybody" (not true), that they sell the iPhone 5S merrily on their website without writing that LTE cannot be used at this time (while offering an LTE tarif with it) and that even on one of the FAQ:
https://www.simyo.de/faq/lte-bei-simyo-15480.html
they lie saying that any LTE capable device that can use the frequencies of the Eplus LTE network can use LTE. Blatantly not true.
I have asked Simyo how they intend to compesate me for not being able to use LTE although offered in the data tarif I am paying for.