Linux

# gammu-config
Then alter modem configuration based on our previous modem information (How to Detect Your Modem). Most settings only required 2 fields:

• Modem port: /dev/ttyUSB0 (Linux) or com10 (Windows)
• Modem connection: usually modern modem support "at115200", if not sure then just type "at"

[gammu]
port= /dev/ttyUSB0
connection = at115200

Windows

Edit "gammurc" file, see above Linux section.

[gammu]
port= com10:
connection = at115200

NOTE:

• On Windows com written as com10: (with colon), instead com10.
• Sometimes text editor provided by Windows can not write to gammurc with error message "file used by another". To solve this issue use CodeLobster PHP Editor, a freeware version available here: http://www.codelobster.com/. CodeLobster is a special editor which support Drupal API

Testing if Gammu can access your modem:

C:\Program Files\Gammu 1.33.0\bin>gammu identify
Device               : com3:
Manufacturer         : Wavecom
Model                : MULTIBAND  900E  1800 (MULTIBAND  900E  1800)
Firmware             : 641b09gg.Q2403A 1320676 061804 14:38
IMEI                 : 012345678901234
SIM IMSI             : 621218742757168

C:\Program Files\Gammu 1.33.0\bin>