iOS 18 beta now lets you send RCS messages to Android users
Briefly

With RCS enabled on the iPhone, your texts to Android users can include larger file attachments, higher-quality photos and videos, audio messages, read receipts, more types of emojis, and smoother group chats.
Even then, make sure you back up your phone before installing any beta.
At this early stage, only Verizon, AT&T, and T-Mobile seem to have turned on the RCS switch.
Read at ZDNET
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