Turn off your phone, then hold the Volume Down + Power buttons to enter Recovery Mode. Select Wipe Cache Partition and reboot.

Go to Settings > Connections > SIM Manager . Turn your SIM off and then back on to refresh the network connection. 2. Troubleshoot Failed Text/MMS Downloads

Ensure you have a stable mobile data connection, as MMS (multimedia messages) often require data rather than just Wi-Fi.

If you cannot download attachments or receive "Message not downloaded" alerts:

If you are looking to "write a text" in terms of creating a .txt file: How To Fix Failed To Send Text Messages In Android

In Message settings, ensure RCS chats are enabled or try turning them off and on again to reset the service. 3. Create or Edit Text Files