My mom just gave me her old iPad. Neither one of us is very technically versed, but she is pretty sure that she canceled the old data plan. However, it still says AT&T in the top left (I turned off cellular data to stop this so now it's just on Wi-Fi). She has an iPad 2, so it may be that they use the same data plan, but how would I go about making sure that my mom isn't paying for two separate data plans, or that I'm not interfering with her current data plan? Thanks!