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The uuidv4() function is a built-in function in JavaScript that generates a unique identifier string. The reason why it may work well on iOS but not on Android in React-Native is due to differences in how the two operating systems handle random number generation.

iOS uses the SecureRandom API, which provides a more secure and reliable source of randomness. However, on Android, the Math.random() method is used to generate random numbers, which may not be as secure or random as desired for the generation of unique identifiers.

To resolve this issue, it is recommended to use a third-party library such as uuid or react-native-uuid, which provide more robust and reliable random number generation across multiple platforms.