unable to update any applications
Unable to update any applications and unable install any app from app store
iPhone 6, iOS 12
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See this article.
If you can’t download or update apps on your iPhone or iPad - Apple Support
If, as your profile suggests, you are still using an iPhone 6, which Apple released over eight years ago, you may well have other issues as apps typically no longer support the four-year old iOS version that is the latest this iPhone supports.