In Google Messages, tap your profile icon and open Messages settings > RCS chats. Connecting means your phone number is being verified. If you see Verify your number, confirm the number for the line you use and make sure that line can receive SMS.
01Read the status before changing settings
Section linkConnecting is the normal status while verification runs. If Trouble connecting. Awaiting retry stays for more than 30 minutes, open Details and use Submit feedback if Verify your number is missing or verification still fails. If you cannot find RCS chats in settings, look for Chat features.
02Check the app and the SIM used for data
Section linkUpdate Google Messages in the Play Store and confirm it is your default SMS app. Make sure the phone can get online. If you have two active SIMs, check your Android SIM settings. Google recommends assigning mobile data to the SIM you use for calls. Menu labels vary by phone.
03Confirm that the number can receive texts
Section linkIf Verify your number appears, tap it and confirm the number when prompted. Google sends an SMS to verify it. Ask someone to send an ordinary SMS to that line. If it does not arrive, troubleshoot SMS reception with your carrier before repeating RCS setup. Avoid repeatedly switching RCS off and on. Google warns that turning it off can remove you from group chats.
04Use the status to choose the next step
Section linkIf the status says your carrier disabled RCS, contact the carrier. If it says Connected, try messaging someone who already has RCS enabled. Check the send icon to see if the conversation will use Wi-Fi or mobile data, SMS, or MMS. Connected describes your setup. RCS in a particular conversation also depends on the other participants.