Nokia 105 RM-908 FBUS Pinout Diagram
https://gsmfixer.blogspot.com/2015/09/nokia-105-rm-908-fbus-pinout-diagram.html
Here is Nokia 105 RM-908 FBUS Pinout Diagram With Full Details. Usually Pinout Diagrams shown the connection of different points in a circuit. By pinout diagram you can easily understand the connections between different components and repair them at the time of need. There are FIVE points highlighted in this diagram as GND, TXDO, VPP, RX, TX.