Here's how to enable iMessage on your iPhone:
1. Open the "Settings" app.
2. Tap on "Messages."
3. Toggle the switch next to "iMessage" to the "ON" position.
This should enable iMessage on your device. Additionally, you can choose which phone number and email address you want to use with iMessage by following these steps:
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Tap on "Send & Receive."
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Select the phone number and email address you want to use under "You can receive iMessages to and reply from."
Here are some additional points to keep in mind:
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iMessage can only be used on Apple devices like iPhones, iPads, and Macs.
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You may need a Wi-Fi or cellular data connection to send and receive iMessages.
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Sending and receiving iMessages is free over Wi-Fi, but sending them using cellular data might incur charges depending on your mobile plan.