How-To 30-Second Tech Trick: How to Block Calls on the iPhone It's real easy to do. By Doug Aamoth Oct. 04, 2013 Share Read Later Send to Kindle Related: 30-Second Tech Trick: How to Charge Your Phone Faster 30-Second Tech Trick: How to Get Started with iOS 7 30-Second Tech Trick: How to Get Siri Riled Up About Google Glass 30-Second Tech Trick: How to Make a Smartphone Dock Out of Paper Clips More 30-Second Tech Tricks