My ex calls me as unknown caller! is there a way tmobile blocks unknown calls?

Anonymous
so i broke up with him 5 months ago and he keeps calling me unknown. I have blocked his number in iphone so he cannot call me using his number so he *67 and calls me unknown. Is there a way i can call tmobile and block his number so even if he calls me unknown i won't be able to get it? how does it work? does anyone know? can anyone help me out?
My ex calls me as unknown caller! is there a way tmobile blocks unknown calls?
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