“+CME ERROR: unknown network message” error while sending AT USSD command

I am trying to execute USSD codes through my GSM modem. When i try USSD command which gives me some options, it is executed but i can't get any operation done from the options. AT+CMGF=1 OK AT+CSCS...
“+CME ERROR: unknown network message” error while sending AT USSD command

I am trying to execute USSD codes through my GSM modem. When i try USSD command which gives me some options, it is executed but i can't get any operation done from the options. AT+CMGF=1 OK AT+CSCS...
Unknown Error Message

Hello everyone: I'll be highly appreciated if anyone of you can help me to clarify the following error message which have bothered me for the past two weeks. User command #2 E:\work\copy_bin.bat...
Unknown Error Message

Hello everyone: I'll be highly appreciated if anyone of you can help me to clarify the following error message which have bothered me for the past two weeks. User command #2 E:\work\copy_bin.bat...
Code that won't execute

Has anyone seen problems were sections of code will not execute when compiled at different optimization levels? For example, we have and application that is run from a menu structure through the UART...