Messaging on my iPhone 18 Pro has been acting up in the strangest way recently. When chatting with Android users, their messages come through as RCS, complete with the familiar typing indicators. Yet, when I reply, my messages are inexplicably sent as SMS instead of RCS. Oddly, this issue seems to affect only one contact. When she messages me, it’s sent as RCS, but my responses always revert to SMS.
What’s even more baffling is that when I use a Pixel device, messages to the same contact go through as RCS, but her replies from an iPhone are received as Text. This inconsistency makes conversations frustratingly disjointed. To make matters worse, there are moments throughout the day when my messages get stuck in the “sending” phase, with notifications telling me they’ll be delivered when I “come back online.” Despite this, I’m still able to send other RCS messages to the same contact without issue during those times. However, I’m usually stuck receiving her replies as plain Text messages.
What is RCS Messaging?
RCS (Rich Communication Services) is a modern upgrade to traditional SMS messaging, offering enhanced features for users who don’t use iMessage. With RCS, you can send and receive high-resolution photos and videos, share links, and enjoy advanced features like delivery and read receipts, as well as real-time typing indicators. Like MMS or SMS messages, RCS messages appear in green text bubbles on your device.
Apple’s implementation of RCS is based on the industry standard. End-to-end encrypted RCS messaging (Beta) in Messages is available with supported carriers and will roll out over time. RCS messages can be end-to-end encrypted when all participants have carriers that support encryption. When end-to-end encrypted, RCS message conversations show “Encrypted” with a lock icon at the top. If you don’t see the indicator, your RCS messages aren’t protected from a third-party reading them while they’re sent between devices.
RCS is a carrier-provided service. When your device connects to your cellular network, it communicates with your carrier and their partners to set up RCS. User identifiers are exchanged for your carrier and their partners to authenticate your device and provide a connection. These identifiers include your phone number and, depending on your carrier, your current IP address.
To use RCS on an iPhone 18 Pro, you need to have a text-messaging plan with a carrier that supports RCS. To check or modify your RCS settings, go to Settings > Apps > Messages > RCS Messaging. If the RCS Messaging setting does not appear, RCS messaging might not be available. For more information about compatibility and setup, contact your wireless carrier.
Potential Fixes for the RCS Messaging on iPhone 18 Pro Issue
- Toggle RCS Messaging off and on
- In the Settings app, tap Apps.
- Tap Messages.
- Tap RCS Messaging.
- Turn RCS Messaging off.
- Turn your phone off.
- After it’s powered back on, go into the settings again and toggle RCS back on.
- Update to the Latest iOS Version
- Ensure your iPhone is updated to the latest iOS version. Apps installed by default on your iPhone, such as Messages, are updated whenever you update iOS.
- Reset Network Settings
- Open the Settings app.
- Select General.
- Tap Transfer or Reset iPhone.
- Tap Reset.
- Choose Reset Network Settings.
- Enter your passcode if prompted.
- Confirm by selecting Reset Network Settings again.
Note: When you reset network settings, all your network-related configurations will be erased. This resets all Wi-Fi networks and passwords, cellular settings, and VPN and APN settings. Make sure to have this information handy before proceeding.
