From National Council on Independent Living: Opposing Electronic Visit Verification:

"The EVV systems that allow cell phones to operate as the point of contact, and call at random times intrude on our lives and privacy.  These systems require the person with a disability or the senior to always have their cell phone on them, to never allow the battery to die, and to hand our phones over to our attendants to use for verification at random times.  Essentially, this means that a 28 year old woman receiving services can never forget her phone when she's running out the door to work, and can never let her cell phone battery die, because if she does, her attendant may be accused of fraud.  This also means that when this 28 year old woman is on an important conference call for work, she may be forced to hand over her phone to her attendant to answer a verification call."