CMS ERROR 350 when sending SMS with RC7620-1

Hello,

We have a weird problem with the RC7620-1 firmware version: 9
SIM is Vodafone Greece
We get a CMS ERROR 350 when sending SMS.

AT+CREG?
+CREG: 0,1
OK

AT+CSCA?
+CSCA: “+306942190000”,145
OK

AT+COPS=?
+COPS: (1,“vodafone GR”,“voda GR”,“20205”,2),(1,“vodafone GR”,“voda GR”,“20205”,
0),(2,“vodafone GR”,“voda GR”,“20205”,7),(3,“WIND GR”,“WIND”,“20210”,0),(3,“GR C
OSMOTE”,“C-OTE”,“20201”,7),(3,“WIND GR”,“WIND”,“20210”,7),(3,“WIND GR”,“WIND”,“2
0210”,2),(3,“GR COSMOTE”,“C-OTE”,“20201”,0),(0,1,2,3,4),(0,1,2)
OK

at+cops?
+cops: 0,0,“vodafone GR”,7
OK

at+csq
+csq: 16,99
OK

at+cmgf=1
OK

at+cmgs=“69744xxxx”

Test

+CMS ERROR: 350

If we attach manually to UTRAN technology

AT+COPS=1,2,20205,2

Then the messages work fine

AT+COPS=1,2,20205,2

OK

at+cops?
+cops: 1,2,“20205”,2
OK

at+cmgs=“69744xxxx”

Hello
+CMGS: 122
OK

The SIM is fine as it works with HL7648RD, HL6528RD modems with the same commands.

if we select UTRAN then there is no fallback in 2G if there is no network in the area so it is not a good workaround.

With another provider’s SIM COSMOTE which is Deutche Telecom it works fine attaching to E-UTRAN.

We think it is a firmware issue related to the provider.

Ideas ?

thanks