Text messages appearing green on an iPhone mean that the messages were sent using SMS (Short Message Service) or MMS instead of Apple's proprietary iMessage system, which shows messages in blue. This typically happens for several reasons:
- The recipient is not using an Apple device (e.g., Android phones), so the message cannot be sent as an iMessage.
- iMessage is turned off on either the sender's or recipient's phone.
- There is no internet connection available to send the message via iMessage, so the phone defaults to SMS.
- Temporary issues with the iMessage service or activation problems on a new iPhone.
In summary, green messages mean the texts are sent as regular SMS texts, which use the cellular network rather than internet data, unlike blue messages which are sent via iMessage between Apple devices.
