[iMore Question]

I received a text message on my iphone 6 from someone not in my contact list and did not write the number down before I accidently erased it I want to get the number back I thought the number would stay

[kataran]

Hopefully you've done a daily backup and it occurred before you deleted it. If so you can restore that backup and your text message will be back

[Darth_Bane]

There's really no way for you to get the text back. You can see if its sitting in your messages app on the Mac, if you have a mac. The bottom line, is if a text has been deleted, its gone forever.

[Ledsteplin]

The number can probably be found online at your carrier account. I know Verizon shows all the calls and texts.
If your quick and have an iCloud back up, it might still be there.