If after you upgraded your SIM to use the RCS protocol, you start using a device (phone) that does not support RCS, then you will need to downgrade/switch your SIM back to using the SMS protocol. Doing so will ensure that you continue sending and receiving text messages without issues.
But how can you make the switch? There are basically two option available to you. This article is here you guide you through the process.
Option 1: Using a RCS Enabled Smartphone
You need to open the message app (Google Messages) on your RCS enabled Android smartphone.
When it opens, tap on the tap on the More icon , that is, the three vertical dots which is at the top-right corner.
From the More menu, select Settings.
On the Settings page, tap on Chat Features.
Finally, toggle off the Enable chat features buttons.
Option 2: Deregistering your SIM from RCS without a RCS Enabled Smartphone.
From any internet enabled device, visit the Google RCS deactivation portal (https://messages.google.com/disable-chat)
Scroll down to the Without your previous phone section. Enter your cell phone number and also specify the country. then click on Send code.
You will receive a 6-digit verification code. Type it in, and click on the Verify button.
When you are done, you will see a message on your browser telling you that Chat Features Have Been Turned Off.
If you see this message, it means that you have successfully switch your SIM from using the RCS protocol to using the SMS/MMS protocol.
Please note, the device which SIM is inserted in needs to have internet access for option 2 to work.
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