cool, I am using a bluetooth module HC-06, GPS module NEO-6M, Arduino UNO and a RC522 RFID kit, connected all together and works like a charm, when you tag an RFID card to the card reader, it collects the current position and send that data to an app on my android device using the bluetooth module, it shows the current point every time you hit the tag...now im trying to downsize my device as I have purchased a A9G GPRS/GSM module to cut out the GPS, Bluetooth and the Arduino out the equation, which only leaves my A9G GPRS/GSM module and RFID kit, I want to connect theses last 2 modules so my device can operate with 2 module as opposed to 4 module, hope this makes sense