Quantity   Component name
1 × ATMEGA328 Arduino board based
1 × DRV8833 Driver (breakout board recommended) Evaluation, Demonstration Kits, Boards and Modules / Evaluation Kits, Boards and Modules
1 × Dial phone(of course)
1 × SIM900 Shield/breakout board (Be careful to take a board that works in your country)
1 × Power Stuff (for system that need 5V)