App Idea

I think this is the right place to post this idea. Sorry if it's not.

Every time I hang out with family or friends, someone always comments on the fact that a lot of the time is spent with everyone on their phones. People can't seem to stay off their phones.

I've got an idea for a simple app that, using location services, recognizes when 2 users are in close proximity to one another, asks the users if they are hanging out, and if they respond yes it asks them if they want to disable their phones for a while. They can choose what to disable and keep enabled (probably phone, messages, maybe email), and then they just hit start. Their phone is disabled and they hang out, hopefully in a more involved way.

Has anything like this been done before? Thoughts on improving the implementation? Would you use it?