i blocked an ex's cell phone number. if he changes his number will he be able to...

[Annie]

...contact me with his phone? i want nothing to do with an ex. so i blocked his number. now he is planning to change his number just to be able to contact me. Does it really work that way? I thought it wasnt so much the number but his line that i blocked...so wouldnt his cell STILL be blocked even if he changes his number? I dont want to change my number but maybe I dont have much of a choice if he can get around me blocking his number by simply changing his number. I have Sprint. He had ATT