<human>: I have a contract with AT&T for a two year phone plan with my boyfriend. We've got a little less than a year left, and when it was up, we were going to switch to a different phone company. 

My mom, however, wants to add my sister to our plan, which would extend it another two years. 

Obviously, this isn't what I want, but I'm not sure if I'm in the wrong here. 

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Other info:

My mom paid the phone for us for about 6 months while my BF and I looked for jobs, then we began to pay it ourselves. 

Currently, we live with my mom, because we're saving up to get an apartment a couple hours away from where we currently are. 

Also, my mom cannot get my sister on a phone plan by herself because my mother has bad credit, and AT&T won't accept her w/o adding a bunch of fees or something.

Can you condense the text into a few key points?
<bot>: Mom wants to extend my phone plan for two years. That's not what I want. Am I in the wrong?