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CME error 100 is an error from your GSM modem that just means 'Unknown Error'.
It is possible that the modem does not support USSD or that there is a bug in the firmware of the modem for this specific USSD command. The USSD command itself is correct so that does not explain the error.
Regards, Henk
6:23 pm
Hello, we are having these error events, please support us.
EventTime Event Source
13/07/2023 8:14:18 The GSM Modem returned +CME ERROR: 100 (Unknown or manufacturer specific error) after the AT+CUSD=1,"*789*1*976395138*5*1*1086#",15 command. (dest: *789*1*976395138*5*1*1086#) CLARO[R&M]
13/07/2023 8:11:24 The GSM Modem returned +CME ERROR: 100 (Unknown or manufacturer specific error) after the AT+CUSD=1,"*789*1*992126374*3*1*1086#",15 command. (dest: *789*1*992126374*3*1*1086#) CLARO[R&M]
13/07/2023 7:05:08 The GSM Modem returned +CME ERROR: 100 (Unknown or manufacturer specific error) after the AT+CUSD=1,"*789*1*992112002*5*1*1086#",15 command. (dest: *789*1*992112002*5*1*1086#) CLARO[R&M]
12/07/2023 23:00:19 The GSM Modem returned +CME ERROR: 100 (Unknown or manufacturer specific error) after the AT+CUSD=1,"*789*1*997446762*3*1*1086#",15 command. (dest: *789*1*997446762*3*1*1086#) CLARO[R&M]
12/07/2023 20:53:39 The GSM Modem returned +CME ERROR: 100 (Unknown or manufacturer specific error) after the AT+CUSD=1,"*789*1*959246422*5*1*1086#",15 command. (dest: *789*1*959246422*5*1*1086#) CLARO[R&M]
12/07/2023 18:33:34 The GSM Modem returned +CME ERROR: 100 (Unknown or manufacturer specific error) after the AT+CUSD=1,"*789*1*997606018*10*1*1086#",15 command. (dest: *789*1*997606018*10*1*1086#) CLARO[R&M]
12/07/2023 18:28:16 The GSM Modem returned +CME ERROR: 100 (Unknown or manufacturer specific error) after the AT+CUSD=1,"*789*1*991214555*5*1*1086#",15 command. (dest: *789*1*991214555*5*1*1086#) CLARO[R&M]
12/07/2023 17:44:59 The GSM Modem returned +CME ERROR: 31 (Unknown or manufacturer specific error) after the AT+CUSD=1,"*789*1*982123660*5*1*1086#",15 command. (dest: *789*1*982123660*5*1*1086#) CLARO[R&M]
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