Annoyed about how to handle rules

For example , one day my husband would tell me my stepdaughter isn’t allowed to be on her phone . Then if I tried to tell her to not be on her phone constantly she’d say but my mom might call then my husband would say I can’t take that right away from her (not that I was trying to do that in the first place) . Then there was a recent incidence where I assume she was either on social media (she’s not allowed to be) or she was watching things she shouldn’t have been because I heard him telling her how she can’t be on her phone and asked if it was ok to tell me the reason why . And she said no . I respect what they want to do but I guess I’m just lost because one day my husband is so adamant about her not being on her phone and if her mom wants to call her she can call us directly then pass the phone to her . Then next day it’s omg you let her stay on the phone all day . Then the next day it’s “you can’t take away her phone if she’s waiting to talk to her mom”