GSM sim 900

Hi, i have a problem with this module, my objective is send and receive sms with this module, it’s connected to arduino uno, and i need that when you send a message the gsm module saves the number or the cellphone and sends a response, for example: a solar panel its connected to the analog input of arduino, so when i send the message asking for the voltage to the gsm module,this module responds to the cellphone sending the voltage. Sorry my bad english

If someone has the code,please send it, i’d appreciate your help, thanks

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