Hi dew8018,
It sounds like you are using Messages on an iPhone and see message text with either a blue or green background.
When you see green text bubble, your iPhone is using SMS/MMS because the other person is not using an iPhone or has not enabled iMessage. When you see a blue text bubble, your iPhone is using iMessage.
How do I know if my message used SMS/MMS or iMessage?
You can tell which type of message you're sending by the color of the Send button and text bubble.
- SMS/MMS: Send button and text bubbles are green.
- iMessage: Send button and text bubbles are blue.


From:
Send messages with your iPhone, iPad, or iPod touch
You should still be able to send pictures to non-iMessage users. If you're not able to, the steps in the "If you can't send and receive MMS" section of this article are helpful for troubleshooting:
iOS: Troubleshooting Messages
Best Regards,
Jeremy