K.C.
you know that almost sounds like my daughter. Even though she is not my step daughter.. She is almost 12 years old. I dont have custody of her but have been fighting for her since she was one. She has always expressed to me that she wanted to live with me and I've been doing everything in my power to make that happen. She also tells my dad and my step mom that she wants to live with them so they keep fighting for her. Last year I was able to gain joint custody and this year I plan on having full custody. Well anyways as I was saying my daughter plays both sides, plus she always forgets the rules, and yes she does lie, she even sneaks things from her nanas and papas house to bring over our house.
I have to tell her all the time that she needs to leave her nanas attuitude at their house because she gets into these moods that make you just want to scream. (Her nana always lays a guilt trip on her if she even says my name at their house, and has told my daughter and the courts that she is never going to live with me because she will never let her go).
Well anyways I know one day it will pass and you might want to talk to your daughter about how she really feels about her mom and about the cell phone...like saying something like when we gave you the phone you said that you werent going to call your mom, but I know you have and I just want to let you know that its alright I just want you to not lie about anything to me. And leave it at that, that way she knows you know and she wont feel your keeping her from talking to her mom and she knows you caught her in a lie. She may feel that you and your husband might get mad at her for talking to her when its your turn to see her, and she may have been afraid to tell you. You maybe able to see if they have a service that records the messages even if your daughter erases them so you can know if she is lying to her mom or ya'll or even if she is talking to a boy.
I hope this helps you alittle. good luck