In a surprising move, Apple has announced today that it will adopt the RCS (Rich Communication Services) messaging standard. The feature will launch via a software update “later next year” and bring a wide range of iMessage-style features to messaging between iPhone and Android users.
Apple’s decision comes amid pressure from regulators and competitors like Google and Samsung. It also comes as RCS has continued to develop and become a more mature platform than it once was.
There can be other servers and apps, for example Samsung has their own app. It’s hard for me to track down details about how they interoperate but it appears that the various services need to agree to work with one another, so I don’t think just anyone can create an RCS app and infrastructure and have it work with Google’s and Samsung’s. However, I imagine Apple is fully capable of it and would be surprised if iPhone RCS wasn’t going through Apples network.
Samsung’s app is just rebranded Google app.