Mange iMessage text in your iPhone, iPad very uniquely, so disable or Turn off iMessage for not saved contacts in iPhone, iPad. Means not disable or block all iMessage from unknown number. After enable this iMessage setting within your setting app, your iMessage app automatically categories in to two different tab. Follow the below steps and Manage all text coming for known person text or unknown person.
Steps for Turn Off iMessage for not saved contacts in iPhone, iPad
Step 1: Go to the Setting app in your iPhone, iPad and iPod Touch
Step 2: Scroll below and Choose Messages, Tap on it
Step 3: At last, you can see option for: Filter Unknown senders, Enable toggle.
Unblock all the contact from iMessage
Above steps works like ignore unknown message and easy to delete from useful message that will listed under the Unknown Senders. Having any query on Turn Off iMessage for not saved contacts in iPhone, iPad and iPod Touch running on iOS 8, iOS 9, Feel free and share with us.