How is someone blocking my number from my boyfriend's phone by using their phone

[hmarie0326]

My boyfriend's ex-wife has some kind of access from her phone to block my text messages through his phone how is she doing that when he has a prepaid phone how can I stop at where she can't do it anymore

 

[hang-the-9]

Unless she has access to his phone account, she can't block numbers to his phone. Have him contact his service provider.