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
Once you enable, go to the Message app and there you can see Contacts & SMS and the second one Unknown Senders.
With above setting you made your searching old message easy compare to default settings. Without any jail breaking tweak you can Block/ Turn Off iMessage for not saved contacts in iPhone running on iOS 8.
Note: in any case, you didn’t receive iMessage or test from the unknown or known/ saved contacts then you must verify that, his/ her contacts couldn’t be in blocked contact list. For that Go to the Settings > Massages > Blocked (Tap on Edit from right top corner) > and Then Tap on minus sign > Unblock.
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.