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To set the operating mode of Huawei 3G sticks, use these AT commands
(at your own risk). Apparently the setting is saved and used in the
future as well.

Any : AT^SYSCFG=2,0,3FFFFFFF,2,4
2G only : AT^SYSCFG=13,1,3FFFFFFF,2,4
3G only : AT^SYSCFG=14,2,3FFFFFFF,2,4
2G preferred : AT^SYSCFG=2,1,3FFFFFFF,2,4
3G preferred : AT^SYSCFG=2,2,3FFFFFFF,2,4

To set the band used, you could use these:

Any band: 3FFFFFFF
EGSM(900): 00000100
DCS(1800): 00000080
PCS(1900): 00200000
GSM850: 00080000
WCDMA2100: 00400000

On Mac OS X, you can use

screen /dev/tty.HUAWEIMobile-Modem

You can use Ctrl-a k to terminate screen.

AT^SYSCFG Huawey command reference

To see the supported values, you can query your own modem sending the “AT^SYSCFG=?” command.

AT^SYSCFG=$mode,$acqOrder,$band,$roam,$srvDomain

$mode
2=Auto-Select
13=GSM only
14=WCDMA only
16=no Change

$acqOrder
0=Automatic
1=GSM prefered
2=WCDMA prefered
3=no Change

$band
3fffffff = All
other (query list with “AT^SYSCFG=?”)

$roam
0=Not Supported
1=Supported
2=no Change

$srvDomain
0=Circuit-Switched only
1=Packet-Switched only
2=Circuit- & Packet-Switched
3=Any
4=no Change

/etc/ppp/chatscripts/mode.3G-only

AT\^SYSCFG=14,2,3fffffff,0,1

/etc/ppp/chatscripts/mode.3G-pref

AT^SYSCFG=2,2,3fffffff,0,1

/etc/ppp/chatscripts/mode.GPRS-only

AT\^SYSCFG=13,1,3fffffff,0,0

/etc/ppp/chatscripts/mode.GPRS-pref

AT\^SYSCFG=2,1,3fffffff,0,0

/etc/ppp/chatscripts/mode.NONE

AT