My iphone can't receive text messages from other servers?

For some reason my iphone will only accept imessages. I can't receive any text messages from other type of phones. This just happen I've been receiving text messages from both iMessage and SMS. Please help, I'm thinking something got changed in my settings.

Go to settings and then messages. I believe there should be something there that says "Use SMS when iMessage is not available". Make sure that is on.

  • Why don't I receive alerts or a notification when I receive a text and I already checked my settings? I adjusted my setting and even put the ringer and notifications on and put the volume and ringer on and I receive no alert, no pop up, alert or notification when someone texts me. Why? This is the iPhone X! I went to the cell phone/ carrier store and they didn't help me. They said to go to the apple store or check the settings. I already adjusted the settings. So what do I do now?
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