what is o2 rcs

O2 RCS stands for Rich Communications Services, which is a messaging service that supports enhanced, conversational experiences without the need to download an app. It is a communication protocol between mobile telephone carriers and between phone operating systems. To use RCS, your contacts must have a Rich Communication Services compatible phone and operating system and have data enabled to receive any communications. O2 UK has enabled RCS Messaging or Chat Messaging support on Samsung Galaxy S20, Samsung Galaxy Z Flip, and Samsung Galaxy A12 in the UK. However, some users have reported issues with activating RCS on their O2 SIM cards. RCS is set to become the new way to communicate, defined as "enhanced smartphone messaging for Android users within the existing SMS platform".