Apple used an Android phone to promote Apple Music on Twitter
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Twitter for Android on the Google Pixel 2 XL

Some people will argue that this isn’t a problem considering Apple Music is available to download on Android – which is true – but there’s no denying that it’s pretty embarrassing to see an official Apple account admin using an Android device rather than one of Apple’s own products. Especially when the amount of effort Apple puts into taking care of its image is considered.
Despite this mishap, things could have been much worse. After all, the Cupertino giant could have used an Android smartphone to promote one of its latest iPhones rather than a service that is widely available to consumers.
Things that are NOT allowed: