The transfer of Android's SMS to Google's messaging app is changing

IPhone users went ahead. Why Android users will be behind? Google's messaging app will soon be transitioning to Android's messaging app. Instead of SMS, the latest instant messaging or chatting app is available on the smartphone. This operating system is Google's operating system. 'Rich Communication Service' or 'Contact' via short RCS is also named 'Chat'. When the new service is launched, the Android smartphones will be pre-fixed (default) messaging apps.
Google has come up with a new version of Apple's iMessage, Facebook Messenger or HotSupa. The service is going to be started by 2019.
There will be no limit on SMS when you start chatting on Android. In the current Android messaging, 160 characters are sent. It is not possible to add images, videos or any other multimedia files. The new app chat can send messages of any number of messages, including messenger or iMessage, as well as images or video. But RCS will send messages using the Internet connection rather than the mobile network. Samsung, LG, Huawei and HTC are registered with many other smart phone maker RCS. That means, the new chat app will work in registered organizations. On other smartphones, such messages will be accepted on the basis of general SMS. Apple's IDEAS is not registered with RCS.
Now the question is whether the RCS will be able to provide security like the iPhone's iMessage.