Can my mom take my contact with my dad away? - Divorce?

[justice]

My mom blocks my dads number through her AT&T account on my phone which means i cant talk to him. If i try i will get a text saying that the number is blocked by my carrier. It is super fucked up, he did nothing wrong and she gives BS answers to why she does it... She said "Your dad calls at inappropriate times" so i asked when she couldn't answer then tried to change the subject and then said that she never told me that he calls at inappropriate times. So anyways can she do that? all i want to do is talk to him... i know there is email but its not as fast neither of us sit on our email all day so please don't tell me "use a social media site." And i have tried to talk to her 2 times and it doesn't work...