The Xadow GSM Breakout will make your life much much easier and bring more possibilities to your RePhone project development.
It draws out 30 pins from the 35 pin Xadow connector to five rows of 0.1" spaced holes with 0.1" spacing between adjacent rows. If you solder wires or through-hole pin headers directly to the breakout pads, you can easily access:
Up to 16 General Purpose Inputs/outputs (GPIOs)
Interfaces like SPI, I2C, UART etc
Pin-outs related to peripheral devices like speaker, audio head phone and microphones