Verizon HTC One M8 on T-Mobile topic

I have an account with T-Mobile, I have my parents there with the iPhones 5s, I just popped in my T-Mobile sim card into my Verizon HTC One M8 and I get LTE and everything! :D everything works fine! I don't know if this is suppose to happen, I'm actually shocked that Verizon didn't carrier lock this phone.

I am leaving T-Mobile little by little but if anyone is wondering if it works with other carriers, well add T-Mobile to the yes list.