How to determine if SIM credit has expired EG21G

Technical Subjects
1

Hi
I am trying to determine via AT codes if the SIM I am using has credit. I have tried the usual AT commands and it indicates that the module EG21G is connected to the Telstra network returning: +QNWINFO: “FDD LTE”,“50501”,“LTE BAND 7”,2950, +CREG: 0,1 +CGREG: 0,1. Currently the only way I have discovered is to try to send an SMS and get a CMS Error 350 after time out

Are there faster ways to determine if the SIM has credit or it is expired?

Thank you

Rob

2

If the SIM card is expired, CREG will return 0,3,or show LIMSRV according to AT+QENG=“SERVINGCELL”

3

Thank you for the reply, I don’t believe the SIM card is expired, just run out of credit. It registers on the network but won’t send SMS as expected, I then recharged SIM and SMS sends ok. See below

So still keen to get a better way than sending a SMS and checking for +CMS ERROR: 350
But perhaps that is as good as it gets.

(10:31:09.146) OK
(10:32:03.098) at+qeng=“servingcell”
(10:32:03.252)
(10:32:03.252) +QENG: “servingcell”,“NOCONN”,“LTE”,“FDD”,505,01,8911A2A,10,450,1,3,3,3045,-101,-10,-74,1,-
(10:32:03.252)
(10:32:03.252) OK
(10:32:55.838) at+qnwinfo
(10:32:55.995)
(10:32:55.995) +QNWINFO: “FDD LTE”,“50501”,“LTE BAND 1”,450
(10:32:55.995)
(10:32:55.995) OK
(10:33:09.664) at+creg?
(10:33:09.839)
(10:33:09.839) +CREG: 0,1
(10:33:09.839)
(10:33:09.839) OK
(10:33:26.122) at+cgreg?
(10:33:26.299)
(10:33:26.299) +CGREG: 0,1
(10:33:26.299)
(10:33:26.299) OK
(10:44:53.575) AT+CSMS=1
(10:44:53.782)
(10:44:53.782) +CSMS: 1,1,1
(10:44:53.782)
(10:44:53.782) OK
(10:44:55.277) at+cgreg?
(10:44:55.483)
(10:44:55.483) +CGREG: 0,1
(10:44:55.483)
(10:44:55.483) OK
(10:44:57.749) AT+CMGF=1
(10:44:57.976)
(10:44:57.976) OK
(10:45:00.671) at+cgreg?
(10:45:00.898)
(10:45:00.898) +CGREG: 0,1
(10:45:00.898)
(10:45:00.898) OK
(10:45:03.164) AT+CMGS=“+61XXXXXXXXX”
(10:45:03.388)
(10:45:03.388) >
(10:45:13.570) test
(10:45:23.772) test
(10:45:30.944) testtest
(10:48:44.252)
(10:48:44.922) +CMS ERROR: 350
Recharged SIM
(11:11:46.869) AT+CMGS=“+61XXXXXXXXX”
(11:11:47.113)
(11:11:47.113) >
(11:11:54.556) 1A
(11:12:01.018)
(11:12:01.660) +CMGS: 33,“24/05/30,11:12:02+40”
(11:12:01.660)
(11:12:01.660) OK