Apple responds to the Beeper iMessage saga: ‘We took steps to protect our users’::Beeper, like Sunbird and Texts, sought to find a way to bring iMessage to Android users. Its app, Beeper Mini, worked well. But a few days after it launched, Apple took steps to shut it down.
Most of this isn’t true, at least not for Google’s implementation of RCS which has e2e encryption, delivery and read receipts, the ability to send messages from the Web app ect. Maybe you need a SIM card, I don’t know.