You can plug the board into you PC and use a hyperterminal to manually "drive" the module as you learn how to use the AT commands. You just need a USB to RS232 adaptor cable. Learning and experimenting with the AT commands will be very difficult without this facility.
If your microcontroller has an RS232 port you can connect it directly to the RS232 port on the evaluation board. Otherwise the little voltage translator board that you have located looks perfect. You can access the 2.8volt UART signals form the edge connector on the evaluation board, pass them via the converter with 5 volt signals comming out.
Did you know that the GM862 contains a Python Script Engine (very C code like) and for many applications does not need to be connected to an external microcontroller?
Connect HV pin to 5volt supply
connect LV pin to 3.3volt supply
connect GND pins to both grounds on both supplies.
Connect Telit RXD pin to RXI pin on converter,
Connect TXD pin on Telit to TXO on converter.
Connect RXI pin on converter to the Tx pin on Stamp.
Connect Rx pin on Stamp to TXO on converter.
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