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Test code for Arduino UNO; ... SIM900 GPRS/GSM Board Quad-Band Module Kit for Arduino. ... RJ45 Ethernet Control Board for 8/16-Ch Relays. SKU: 101-70-C03. please i am doing a project on vehicle tracking system using arduino nano Atmega328 and Siemens GSM/Gprs Modem TMA- M39i which is a RS232 serial interface. The problem i have is that i cannot send sms message message to my phone with the arduino code i have written but when i test the Gsm modem and arduino on hyper terminal they both work ok.