It's okay to charge an iPhone with a vivo charger. Apple's basic requirements for the charger are: provide a standard USB output interface; Provide no less than 1A output current power supply capacity, but the size of the power supply capacity is only related to the charging speed, the maximum current of the power supply is too small, the charging time is extended, but will not cause damage to the phone, and when the power supply capacity is strong, because the Apple phone built-in charging control loop, will automatically limit the maximum current of charging