Final answer:
The hairstyle described is called Twist-out.
Step-by-step explanation:
The hairstyle described, where the flat twists are untwisted and opened to create a wavy texture, is called Twist-out.
A twist-out is a popular hairstyling technique used primarily by individuals with natural hair textures.
To achieve a successful twist-out, it is important to ensure that the hair is completely dry after setting it in flat twists. Failure to do so may result in frizz and an undesirable appearance.