Texts that I send to some people show in green bubbles while others show in blue ones. What's the difference?
You may have noticed that some of your iPhone text messages have either a blue or green background.
A blue background means that the message exchange is happening via iMessage with another iOS device (an iPhone, iPad, iPod Touch, Mac, etc). These messages are sent through your cellular provider's data network or via WiFi (no cell service needed), and text message rates don't applyA green background means that the message is being exchanged with a non-iOS device (Android, Windows phone and so on) and was delivered via SMS through your mobile provider. Messages can only be exchanged with these recipients when you have cell service.
A green background can also mean that a text message sent from an iOS device could not be sent via iMessage for some reason. It will instead be sent as an SMS.
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If all your messages are green, it could mean that iMessage has been disabled on your device Navigate to Settings > Messages and enable iMessage.