Huawei E220 USB HSDPA modem on Linux

Tested on Ubuntu Hardy. When you plug the modem in, things happen:


[ 1872.829603] usb 5-2: new full speed USB device using uhci_hcd and address 11
[ 1872.988741] usb 5-2: configuration #1 chosen from 1 choice
[ 1872.998189] usb-storage: probe of 5-2:1.0 failed with error -5
[ 1872.998226] airprime 5-2:1.0: GSM modem (1-port) converter detected
[ 1872.998441] usb 5-2: GSM modem (1-port) converter now attached to ttyUSB0
[ 1873.006403] usb-storage: probe of 5-2:1.1 failed with error -5
[ 1873.006437] airprime 5-2:1.1: GSM modem (1-port) converter detected
[ 1873.006615] usb 5-2: GSM modem (1-port) converter now attached to ttyUSB1
[ 1873.057365] scsi30 : SCSI emulation for USB Mass Storage devices
[ 1873.058803] usb-storage: device found at 11
[ 1873.058810] usb-storage: waiting for device to settle before scanning
[ 1876.078727] usb-storage: device scan complete
[ 1876.082294] scsi 30:0:0:0: CD-ROM HUAWEI Mass Storage 2.31 PQ: 0 ANSI: 2
[ 1876.117573] sr0: scsi-1 drive
[ 1876.117674] sr 30:0:0:0: Attached scsi CD-ROM sr0
[ 1876.117754] sr 30:0:0:0: Attached scsi generic sg1 type 5


As you can see, we get two serial ports and a CD-ROM drive. The second serial port and the CD-ROM drive can be ignored. PPP works straight away with the following config:


noauth
connect "/usr/sbin/chat -v -f /etc/chatscripts/e220"
debug
/dev/ttyUSB0
230400
crtscts
defaultroute
noipdefault
user ignored
remotename whatever
ipparam whatever
usepeerdns


Here's the e220 chatscript (put in into /etc/chatscripts, replace the "****" with your pin code, replace "omnitel" with your provider's APN):


# Chat file for Huawei E220 HSDPA USB modem
ABORT BUSY ABORT 'NO CARRIER' ABORT 'NO ANSWER' ABORT DELAYED
'' AT
OK AT+CPIN="****"
OK ATX3
OK 'AT+CGDCONT=1,"IP","omnitel"'
OK ATDT*99***1#
CONNECT ""