Hello,
We have a Mikrotik LTE Router Chateau LTE12 (RBD53G-5HacD2HnD-TC&EG12-EA). It works with a Sim Card from other operators in Germany, but not with T-Mobile (Telekom). I insert the Sim Card, it shows Telekom.de as an operator, it takes an ip address, shows the signal but there is no internet. I insert the same Sim Card into other LTE Router such as FritzBox, then it works. I added manually APN settings of T-Mobile, but it didn't help. Is there someone that faced this problem and solved it? Thanks in advance.