I’m using AT command to turn on the notifications:
AT+CNMI=2,1
I don’t get any notification when an SMS is received. I’m communicating with the EC25 module via RX and TX pins (using an Arduino).
Dear Miguelwon,
Thanks for your inquiry in Quectel forum.
About your issue, please use the following command to confirm it. Thanks!
You can use AT+QURCCFG=“urcport” to check whether the return value is uart1, if it is not uart1, please use the following command to set it.
AT+QURCCFG=“urcport”,“uart1”
Ok, it worked! Thank you very much! You saved my day! 
My pleasure. Enjoy your life. Thanks!