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How often are you supposed to reply to this SMS messages to prove your still with your phone? If they only did it during 'waking hours' what is to stop someone going out at night. And if they do send them every day for 24 hours every day for 2 weeks, your not going to be able to sleep, take a shower, listen to music for the fear you might miss replying to an text and get big brother coming bursting down the door.