I have a iPhone XS and it shows two bars with LTE next to them. But I have no internet connection at work. I have unlimited data plan and I am not over the limit. I rebooted it but it didn't help. I even tried disabling LTE but it didn't help either. My co-workers with Verizon or AT&T get cellular data just fine. As soon as I walk outside the building I get good reception. Is t-mobile just bad indoors? I have no trouble at home with reception.