Google Message is built with the technology called RCS (Rich Communication Service) is the future of text messaging. It brings many features you've probably used in instant messaging apps, such as read receipts, typing indicators, and high-quality images, to standard texting. Meaning, it needs to be setup before you can enjoy its features. On my personal experience, you need to have a credit load on your sim to enable RCS. What's the advantage of RCS? Once you activated, u can now see if other users are typing or replying to your message, which a conventional sms doesn't have. I guess the best feature of rcs is being able to send text messages, photos WITHOUT credit load (after activation) but u have to be connected to a Wi-Fi. To enable your RCS go to Google message, settings - CHAT FEATURES. Mine is CONNECTED since its already activated. P. S. I experienced the VERIFYING NETWORK when d system automatically activates but no credit load on the sim so make sure u have at least 20 pesos. By the u should only have 1 default sms app. You don't need MMS anymore since that feature is dated. Rcs is the future. Rcs is the android counterpart of imessage of apple. Hope this will help your problem. 
I already have google message. It says that the operator does not support this feature.
