Microcontroller › AVR › ATmega GSM › GSM
July 14, 2017 at 5:42 am #14626
Hari Prasaath K
Check with the network in GSM, Before sending a message using coding, use GSM AT command any terminal software to test to verify whether GSM is working properly, also check with your hardware connections.
Check with below link it will help you, If u come again with the same problem, ask your querry