Anyone else having problem activating galaxy watch 4 as standalone?

We switched from Verizon and I've been regretting it little by little. We had absolutely ZERO issues using our galaxy and apple watches, independent of Bluetooth and our phones, on Verizon's network. We paid for a line, and we were able to use the LTE capability for unlimited calls/texts/data. It worked better when near my phone, but the point is it worked! 

I don't understand T-Mobile's DIGITS app and it's not available for the Galaxy watch OS anyway. We're also paying for 3 watch lines, and on T-Mobile's network my watch is only working when paired with Bluetooth. We just ordered a brand new phone for my dad but I have half a mind to send it back while I still have my old phone. I have had one issue after another with T-Mobile from porting our numbers to placing orders to now paying for a service that apparently T-Mobile does not have the technology capacity to support??? All our devices are owned and purchased from OEM, so T-Mobile better get right or I'm gone.