iMessage already works with SMS/RCS, which is low level enough that any messaging service could use it as a method to interoperate with anything else. What iMe

iMessage already works with SMS/RCS, which is low level enough that any messaging service could use it as a method to interoperate with anything else. What iMessage can’t do is translate a lot of the QOL and UI features, each client will have to adapt to read those on their own.