If you see message like «You can’t delete contacts from read-only accounts, but you can hide them in your contacts lists.» when you trying to delete some contact from your Android phone, this means that some another app is synced with your contact list and blocking it. If you are using Viber, that it’s certainly it.

Just open Viber, go to the Settings / General menu and disable an option «Sync contacts».

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Document date: November 11, 2017