The following message will freeze an iPhone when received as an iMessage and displayed as a banner notification. Use responsibly.
This bug appears to only affect up to iOS v10.1.1. 10.2+ does not seem vulnerable.
Click this link on your iPhone to open a text message with the necessary text pre-entered.
Filip (EverythingApplePro) found a way to make this bug affect iOS 10.2+ upon receipt. Download this contact file and send it via iMessage. You must save into iCloud drive before sending if on iOS.
He also uploaded a video tutorial
The sending method has been greatly improved and now does not require a computer for either version. To access the old version of this page, click here
Click this fix by @vincedes3 to fix broken messages application
DO NOT ACCIDENTALLY IMPORT CONTACT INTO YOUR CONTACTS LIST ON ANDROID. IT WILL BREAK YOUR CONTACTS APP.
Download this contact file if you're sending from Android and the other is too large
Questions? Tweet me @preston_159. Please don't contact me for help using it.