The NSA says to do this once a week

The NSA says to do this once a week: Reset your phone’s advertising ID. It’s a unique identifier they use to serve you targeted ads. The more data that’s gathered, the easier it is to pinpoint exactly who you are. On iPhone, do this under Settings > Privacy & Security > Apple Advertising, and toggle off Personalized Ads. On Android, go to Settings > Google > Ads, and toggle the switch for Opt out of Ads Personalization.

Tags: Apple, security