How to change messaging and calling app in oppo r9s Is there a way to change messaging and phone call apps without the phone defaulting to stock on an unrooted oppo r9s. Thanks
Whatever settings you change for the messaging will not make any difference, the phone will always revert to the default app. I took this up directly with OPPO and had the following response: 
"We decided not to allow customer to set 3rd party applications as default message application, for security of the devices cannot be guaranteed. We also want to let you experience our built-in application and to be spared from the malfunction like virus, bug or etc."

Not the response I wanted or expected!