Start in Google Messages at profile menu > Messages settings > RCS chats and check the status before changing anything. A carrier-disabled or unsupported status needs a carrier-side answer; “Connecting” or a verification error points to your phone number setup; one undelivered message is usually a connectivity or recipient issue. These are different problems, so use the branch that matches what Messages shows.
First, check the RCS status and basic requirements
Open Google Messages, tap your profile menu, then go to Messages settings > RCS chats. Record the displayed status. RCS requires a supported device and carrier, Google Messages as the default SMS app, and an internet connection. Initial setup also requires that your phone can receive SMS for number verification; Google lists Android 5.0 or later as a requirement. See Google’s RCS activation and troubleshooting instructions.
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- Confirm Google Messages is your default SMS app.
- Check that mobile data or Wi-Fi works, airplane mode is off, and the phone has signal.
- Make sure your plan or account can send and receive messages and that the SIM is inserted and active.
- Update Google Messages and Google Play services. The other person should also use a current version of Google Messages.
- If two SIMs are installed, check Google’s FAQ for the dual-SIM setup: it says the calling SIM should be configured as the data SIM.
Carrier and regional availability varies. If RCS is missing or Messages says the carrier does not support it, app settings cannot create carrier support. Confirm availability with your carrier; Google also lists device and carrier availability limits in its RCS chats FAQ.
If Messages says the carrier disabled RCS
Contact your mobile carrier: Google’s guidance says the carrier must resolve a carrier-disabled status. When the carrier confirms the issue is fixed, return to Messages settings > RCS chats and tap Retry. If it remains broken, open Details in RCS settings and choose Submit feedback, as described in Google’s instructions.
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If RCS is connecting or phone-number verification is stuck
“Connecting” can be normal while Google Messages verifies your phone number. If “Trouble connecting. Awaiting retry…” remains for more than 30 minutes, Google says Messages may be having trouble verifying the number. If the app offers Verify your number, follow that prompt, confirm the number is correct, and check that the phone can receive Google’s verification SMS.
If the verification option is missing or the steps fail, use Details > Submit feedback in RCS settings. Google’s FAQ identifies the 30-minute condition for this status; it is not a universal wait time for every RCS issue.
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If an RCS message is undelivered
Delivery can be delayed if either person loses cellular or internet service. Google Messages continues trying to deliver unsent messages. Check your connection and, if the recipient is offline, allow time for service to return. For a message that still needs to go out, tap its timestamp and choose Switch to text (SMS/MMS). Google also documents a setting to resend undelivered messages as text in its message delivery controls.
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If there is no encryption lock: this is not phone-number verification
Phone-number verification activates RCS for your number. Encryption verification is a separate check within an eligible conversation. In Google Messages, a lock icon on the send button indicates end-to-end encryption. Google says this protection works in eligible conversations when everyone uses Google Messages with RCS turned on. You can open conversation details and select Verify encryption to compare codes; a call can be used to read a code aloud. Comparing codes is optional—the manual comparison is not required for eligible messages to be encrypted.
If there is no lock, check that both people have current Google Messages and RCS enabled. Google also advises updating Carrier Services where it is installed. SMS/MMS messages are not end-to-end encrypted. See Google’s encryption guidance.
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Key Verifier eligibility
Google’s current support page lists Android 10 or later, Google Contacts 4.60, Google Messages build android_20250723.00_p0, and the Android System Key Verifier app among the requirements for its Key Verifier feature. Google says it is not supported on Android Go devices, tablets, or wearables. These requirements can change; check the linked Google instructions for current eligibility rather than assuming the feature works on every Android phone.
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If RCS stopped after switching from iPhone
Google recommends deactivating iMessage for your phone number when messages are not arriving after a switch from iPhone. Then return to RCS chats settings and check the status again. Google includes this case in its sending, receiving, and connection troubleshooting guide.
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Quick symptom guide
| What you see | What to do |
|---|---|
| RCS option missing or unavailable | Check device and carrier availability; regional and carrier support varies. |
| Carrier disabled RCS | Ask the carrier to resolve it, then tap Retry in RCS chats settings. |
| Carrier not supported | Confirm support for your line with the carrier; app troubleshooting cannot enable unsupported service. |
| Connecting | This can be normal during number verification. Confirm SMS reception if prompted. |
| “Trouble connecting. Awaiting retry…” for over 30 minutes | Use Verify your number if shown; otherwise submit feedback from Details in RCS settings. |
| One message is undelivered | Check connectivity and use the message timestamp menu to switch to SMS/MMS if needed. |
| Only one contact is affected | Check the number, country code, and blocked-contact status. |
| No encryption lock | Check that both people have current Google Messages and RCS enabled; SMS/MMS is unencrypted. |
| Messages fail after leaving iPhone | Deactivate iMessage for the phone number, then check RCS status again. |
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