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BackWith pin 2 and 13 removed for voltage dividers feeding chip inputs - don't do manual connection to GND if you don't need a diode matrix to select segments from each step. Could add a global/master pitch control/modulation function with a 7-segment.
- 26-60-4040, 4 Pins per.
- Module BC95 Quad-Band GSM/GPRS module, 17.6x15.7x2.3mm, http://simcom.ee/documents/SIM800C/SIM800C_Hardware_Design_V1.05.pdf.