1. The charging color of the phone turns yellow because the \"Low battery mode\" is turned on, which is a mode of increasing battery life of the iPhone, and the iPhone will temporarily reduce background activities such as downloads and email acquisition until the iPhone is fully charged.
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2, if you want to turn off the low power mode, you can enter the [Settings] - [battery] option, turn off the [low power mode], so that the battery icon will return to green, or very low power red;
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3, generally full charge is green, the battery is used to half or less than half of the time will show yellow, the mobile phone is used to less than 20% of the time is generally red, so the battery power is different, it will show different colors.
Charging symbol yellow means that the way of charging is not the same, if the yellow charging sign is displayed, it represents the flash charging state, and the white sign is ordinary charging.