#RCS Messaging
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RCS on iOS 18 Not Working? Try These Fixes
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If RCS isn't working on your iPhone, make sure you've installed iOS 18, check RCS availability in your region, and make sure your network carrier supports RCS Messaging. Also, you should check your internet connection or toggle Airplane Mode. If nothing works, try restarting your iPhone.

What is RCS Messaging? Explained
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RCS or Rich Communication Services is a messaging protocol that was first developed in 2007 by a group of industry stakeholders and was later adopted by GSMA. RCS offers a much better texting experience with high quality media, no character limit, read receipts, typing indicators, and even group chats. It's available on Android and iOS both, with the support for latter only arriving recently.