My text message are not turning blue when I text another person with an iPhone

Hello Lexi1257,

Thank you for using Apple Support Communities! I understand that when you text another person with an iPhone, the messages aren't sent as an iMessage. I would be happy to help provide steps to take next.

I'd like to start by clarifying; does this happen only when sending a text to a specific contact or does it happen with multiple contacts? If it's occurring only with a specific contact, here's some potential causes to rule out:

If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support

"If you see a green message bubble

If you see a green message bubble instead of a blue one, then that message was sent using MMS/SMS instead of iMessage. There are several reasons for this:

• The person that you sent the message to doesn't have an Apple device.
• iMessage is turned off on your device or on your recipient’s device. To check if iMessage is turned on for your device, go to Settings > Messages > iMessage.
• iMessage is temporarily unavailable on your device or on your recipient’s device."

The following support article provides some additional steps to take if iMessage isn't working as expected with multiple contacts:

If you get an error when trying to activate iMessage or FaceTime - Apple Support

Cheers!