Add more info about error

README.md

@@ -164,13 +164,23 @@ root@OpenWrt:/# mmcli -b 1
              | total-bytes tx: 79
 ```
 
+Errors :
 
+```
+QMI protocol error (14): 'CallFailed'
+```
+
+
+```
+call end reason (3): generic-no-service
+verbose call end reason (3,2001): [cm] no-service
+```
 
 Next step: qmi-utils!
 
  - https://forum.sierrawireless.com/t/mc7354-got-qmi-error-callfailed-when-starting-network/9053
  - https://community.autopi.io/t/error-when-starting-qmi-connection/2338
-
+ - https://lists.freedesktop.org/archives/libqmi-devel/2018-January/002707.html
 
 ## Logs