I think developers of large apps such as Whatsapp will be aware of this and will be aware of Google Cloud Messaging: https://developers.google.com/cloud-messag

I think developers of large apps such as Whatsapp will be aware of this and will be aware of Google Cloud Messaging: https://developers.google.com/cloud-messaging/ https://developers.google.com/cloud-messaging/ This handles all aspects of regular polling so that adding more messaging applications shouldn't negatively affect the battery performance. Instead the application should be alerted and awoken if a relevant message is pushed to the device.