If your text bubbles are green, and you'd want to have them blue, then in this video, I'll be showing you the process of enabling it and also some possible fixes, in case it doesn't work for you.

Hope this video helped you out.

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Timestamps:
0:00 Green / Blue Bubbles on iPhone
0:08 Quick Explanation
0:28 Enable iMessage
1:08 Send as SMS - OFF
1:57 Who Are You Texting?
2:47 Basic Troubleshooting
3:22 Conclusion

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