Unable to connect Chamberlain garage door opener via 5g internet

T-Mobile:  You are making things way too complicated for new users.  I found that if I just carry my T-Mobile box into the room where I am trying to connect a device to the T-Mobile service, plug it into the same electrical circuit that my device is plugged into I can set up anything I want to.  I have successfully set up two ROKU devices, MyQ smart garage door opener, my Ring Doorbell Pro and a Ring Spotlight camera on my back patio.  The T-Mobile box likes to be in a window for the best signal and when I was in the garage doing my MYQ smart garage door, I just left garage door open and I got the best signal of anywhere in the house.  Everything connects right up, as long as you follow the exact steps set forth for each individual device and they all prompt you through very easily.  If a female 75 years old can do this, I would think anyone could!