How does Apple's SMS turn blue to green?

Different colors are an inherent function of Apple's mobile phone ios system, which is called imassage. Can be turned off in the settings.

Specific steps:

When their mobile phones are all Apple phones, the messages they send to each other are upgraded to imassage, and the information turns blue.

As shown in the figure:

This function can be turned off in the settings.

1. Open the information in the settings.

2. click open to close imassage.

At this time, it turns green.