mobile

I have a nexus 6 that was setup without a sim and had no additional software added to it. I then put a verizon sim in and was able to use 611 to just call. Now, I switched to tmobile and simply changed sims. When I try to call 611 now it just goes to a screen that saya "processing your information" and then drops out to "call ended". Anyone know how to get it working properly?