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Required capabilities for Messaging application
If we are using new SendAs API (RSendAs), we don't need any capabilities as the user can grant the right to use messaging features with a "single shot" grant.
In other cases:
- A messaging application is usually using an operator network so we always need NetworkServices.
- When our application is reading incoming (or locally stored) messages, we need ReadUserData.
- When our application is sending messages, we need WriteUserData.
- If our applcation is reading or manipulating message service settings, we need ReadDeviceData / WriteDeviceData accordingly.