Your iPhone messages could be green for two reasons: you're texting Android users, or you're not connected to Wi-Fi.
Signs of a broken iMessage, according to Apple, include a "Not ... messages only being sent in green bubbles as SMS or RCS, messages getting sent with your email address, and the same phone number ...
Apple's communication service can be jerky on current iPhones. If there are problems, you should follow these tips from the manufacturer.
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