The RCS-UP (Rich Communication Services – Universal Profile) specification has been around for a while. Here’s a timeline of some major RCS Universal Profile announcements.

• 02/08 – GSMA takes over RCS 
• 12/08 – RCS 1.0 specifications released
• 10/12 – RCS launches Joyn
• 02/14 – Jibe announces RCS hub 
• 07/15 – Samsung works with T-Mobile on RCS initiative
• 09/15 – Google acquires Jibe Mobile
• 02/16 – Google partners with GSMA to launch Sprint 
• 11/16 – RCS-UP 1.0 specifications released
• 11/16 – Sprint Announces RCS-UP 
• 12/16 – Rodgers Announces RCS-UP 
• 02/17 – Samsung announces RCS-UP
• 03/17  – Samsung Acquire New Net Communications
• 07/17 – RCS-UP 2.0 specifications released
• 12/17 – RCS-UP 2.1 specifications released
• 05/18 – RCS-UP 2.2 specifications released
• 10/18 – US Cellular announces RCS-UP
• 10/18 – T-Mobile announces RCS-UP
• 11/18 – Verizon announces RCS-UP
• 12/18 – RCS-UP 2.3 specifications  released
• 01/19 – Google Fi announces RCS-UP

There is a Google Doc that is being crowd sourced that shows which carriers have had successful connection tests with other carriers here.