I’m only able to text other iPhone users from my iPhone 6, why?
Why can I only text iPhone, iPod, etc but no android phones?
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Despite the previous post, there is no setting to turn SMS on or off on your iPhone. You need to contact your carrier as SMS is a carrier feature.
There is a feature "Send as SMS" in Messages. However that only affects what happens to an iMessage that fails to send, as the explanation underneath the setting explains: "Send as SMS when iMessage is unavailable".
Only your carrier can fix this.
