Internetaccess via Huawei E220 UMTS/GPRS Modem 
Kernel < 2.6.20 needs a udev rule:

http://www.kanoistika.sk/bobovsky/archi ... eiAktBbo.c

/etc/udev/rules.d/82-huawei220.rules

ACTION=="add", SUBSYSTEM=="usb_device", \
ATTRS{idVendor}=="12d1", ATTRS{idProduct}=="1003", \
RUN+="/usr/sbin/huaweiAktBbo"

/etc/ppp/peers/huawei
ttyUSB0
460800
idle 7200
lock
crtscts
modem
noauth
#usepeerdns (sometimes i got no dns -> edit /etc/resolv.conf)
replacedefaultroute
defaultroute
noipdefault
noccp
nobsdcomp
novj
user "web"
password "web"
connect /etc/ppp/peers/huawei-chat
disconnect /etc/ppp/peers/disconnect-chat
ipcp-restart 8
ipcp-max-configure 30
ipcp-accept-local
ipcp-accept-remote
noipv6
noipx
mtu 1420
connect-delay 10000
noproxyarp
novjccomp
updetach
debug

/etc/ppp/peers/huawei-chat
exec chat                                   \
TIMEOUT 5 \
ECHO ON \
ABORT '\nBUSY\r' \
ABORT '\nERROR\r' \
ABORT '\nNO ANSWER\r' \
ABORT '\nNO CARRIER\r' \
ABORT '\nNO DIALTONE\r' \
ABORT '\nRINGING\r\n\r\nRINGING\r' \
'' \rATZ \
TIMEOUT 3 \
SAY "Press CTRL-C to close the connection at any stage!" \
SAY "\ndefining PDP context...\n" \
OK "AT+CPIN?" \
READY-AT+CPIN="XXXX"- \c \
OK AT+CPIN? \
READY \c \
OK "ATE1V1&D2&C1S0=0+IFC=2,2" \
OK AT+CGDCONT=1,\"IP\",\"fullspeed\" \
OK ATD*99***1# \
TIMEOUT 22 \
SAY "\nwaiting for connect...\n" \
CONNECT "" \
SAY "\nConnected." \
SAY "\nIf the following ppp negotiations fail,\n" \
SAY "try restarting the phone.\n"

/etc/ppp/peers/disconnect-chat
exec /usr/sbin/chat -V -s -S    \
ABORT "BUSY" \
ABORT "ERROR" \
ABORT "NO DIALTONE" \
SAY "\nSending break to the modem\n" \
"" "\K" \
"" "\K" \
"" "\K" \
"" "\d\d+++\d\dATH" \
SAY "\nPDP context detached\n"

/etc/network/interfaces
allow-hotplug huawei
iface huawei inet ppp
provider huawei

http://wwwu.uni-klu.ac.at/agebhard/HuaweiE220/
http://linux.frankenberger.at/Huawei_E220.html
http://oozie.fm.interia.pl/pro/huawei-e220/

Often DNS is not set during PPP connection. A workaround is

/etc/ppp/options:
ipcp-max-failure 30


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