This reply was posted to help another iPhone user with similar issues. It sounds like this could be a problem with your carrier or carrier settings. If you have not already done so, you should check to see if there is an available update for carrier settings.
ChrisJ4203
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A text message to a non-iOS user is an SMS. Sending a photo to a non-iOS user is MMS. To accomplish that by the iPhone, you need to have a supported plan from your cellular carrier, and you need to have cellular data turned on. Check with your carrier to ensure that you have a provision for SMS/MMS on your account.
SMS/MMS to a non-iOS device is handled through the carrier. If you continue to have problems, contact your carrier.They may need to fix the provisioning on your device.
Posted on Mar 5, 2018 12:57 PM