I want to make call using phonebook number

please help me

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How many entries will be in the 'phone book, how often will they change and which Arduino are you using ?

here i want to use 2 number..which number is saved in my sim card..when i am calling then my arduino read the number and call..

This manual https://www.elecrow.com/wiki/images/2/20/SIM800_Series_AT_Command_Manual_V1.09.pdf gives details of the AT commands to retrieve numbers from the 'phone book on the SIM