Coins are not interchangeable between Android and iOS due to the platform providers' policies.
Platform providers (Google, Apple) restrict importing of payment information stored on other platforms or third parties. Please refer to the information below for more details.
Android: Coins purchased on Android devices can only be used on the WEBTOON app for Android. Theses Coins are not interchangeable with Coins purchased on iOS devices. They cannot be accessed or used on iOS devices.
iOS: Coins purchased on iOS devices can only be used on the WEBTOON app for iOS. Theses Coins are not interchangeable with Coins purchased on Android devices. They cannot be accessed or used on Android devices.