Why can't I send texts from my iphone

Alright so I have an iphone 4 with the latest version of iOS downloaded. I try to send an sms text and it keeps saying not delivered in red.iMessage is on I reset my phone already and my number is correct where it says "my number" help please any tips are helpful!

Try turning it on frist

I have the same phone and newest ios update too! Lol but I think it's because you might not have wi-fi. Go to the apple website because they have a apple help center or call apple.

Tap the red icon and hit try again

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