Setting the Huawei modem with the TP-Link router under LTE in T-mobile.

I have a SIM card in Tmobile registered for the company, I hope that the public dynamic IP address is enabled there (the subject is currently being clarified, because the consultants mixed up my account including ignorance of a permanent IP address, for which I do not want to pay extra). I received information from them that I should change my APN from internet to date, because it is set to internet by default. I have a Huawei E3372 modem with the PLAY logo. Internet on this modem with a SIM card works properly on default settings, i.e. APN internet. After changing to APN, the date does not connect. You may need to enter other settings manually, such as another access number (currently * 99 #), username and password (currently internet / internet) or some DNS. Ultimately, as soon as it starts working with APN data, I want to run it on the TP-Link MR 3420 router in hardware version v.2. I am asking for help, what can I diagnose myself, is Tmobile a problem in general?

APN internet, i.e. without a public IP with external access. If it works then you don't have a public IP service. Explain this with T-mobile, let the consultants provide you with configuration data if this service is to be provided. And the choice of hardware is weak, E3372 from Play but in what version s-153 or h-153, regular or HiLink? And MR-3420v2 and LTE modem support are a failure.

Generally, I have transferred this SIM card from a private person to a company, because as I was provided several times, the SIM card to the company has a dynamic public address assigned from the machine, and only a static one is charged. However, it seems to me that probably the people from tmobile misled me with this, so I do not agree with them by phone anymore, I submitted a complaint via email and I am waiting for specific messages from someone a bit more oriented than those funny consultants who do not even know what it comes. As for the equipment, the modem is h-153, and TP-link, however, at least version 3, v2 I have at home, and the other router (it has a newer menu) I bought for a place where I have an IP camera and I just wanted to put on this system recorder. The equipment is not professional, but the hell better for me, since it fulfills its task and works after LTE.

If you like the museum MR-3420 to support the LTE modem, use it if the v3 version proves to be compatible with the E3372h-153 modem. I do not recommend this router for such applications. The router has insufficient memory, has problems with powering the LTE modem via USB and OFW has long caused problems, resets the modem during intensive work over WiFi. A lot has been written about him and his problems. This is not turn on and use equipment. Especially when the modem is in the normal version. A typical budget solution from a few years ago.