Hi Tinkerbel: I think whether the cell phone is left behind or not is dependent on the person. I am close to Shannon's age and I often leave the house without my cellphone. I either forget it, don't charge it, or sometimes just don't care to bring it. So I don't think leaving without her cellphone is not necessarily indicative that something has happened, it just sadly makes it more difficult for her to contact someone if she is in trouble