Use Android phone as 3G modem on Mac OSX

** Only tested at Google Nexus One

Reference from :
Using Android Phone as a USB Tether on Mac OS X
Tethering android and OSX without root
Mac OS X Droid Tethering (USB/Wired)

1. Download and install necessary applications at OSX :
- TunnelBlick OpenVPN for Mac OS X
- tuntap for Mac OS X
* need to reboot to make sure kext got loaded at startup.
* or manually load them by blow command w/o reboot :
sudo kextload /Library/Extensions/tun.kext
sudo kextload /Library/Extensions/tap.kext

2. Download and install azilink.apk at android phone :
- azilink for google android

* execute azilink at android phone, enable service

3. Download Android SDK, cp tools/adb into executable path ( like /usr/sbin )

4. Enable USB debugging on the Android phone :
- Settings>Applications>Development>USB debugging.

5. Save blow script into ~/azilink.sh ( from http://pastie.org/701122 ), and execute it :

#!/bin/bash
#
# azilink for OS X
# based on http://pastie.org/405289 but works with Tunnelblick only
# (no need to install a separate copy of OpenVPN2 from macports
# or building from source by hand, thankfully)
# Requires:
# - azilink running on android phone (http://code.google.com/p/azilink/)
# (run the app and check the box to start the service).
# - adb on system path (comes with the Android SDK;
# add its tools folder to your PATH in ~/.profile or
# place or symlink the sdk's tools/adb file in e.g. usr/local/bin or somewhere else on the PATH)
# - Tunnelblick, a nice OS X packaging of OpenVPN (http://code.google.com/p/tunnelblick/)
# Install Tunnelblick to Applications. Tested with Tunnelblick 3.0b22

init() {
adb forward tcp:41927 tcp:41927
sudo /Applications/Tunnelblick.app/Contents/Resources/openvpn --dev tun \
--script-security 2\
--remote 127.0.0.1 41927 \
--proto tcp-client \
--ifconfig 192.168.56.2 192.168.56.1 \
--route 0.0.0.0 128.0.0.0 \
--route 128.0.0.0 128.0.0.0 \
--keepalive 10 30 \
--up "$0 up" \
--down "$0 down"
}

up() {
tun_dev=$1
ns=192.168.56.1
sudo /usr/sbin/scutil << EOF
open
d.init
get State:/Network/Interface/$tun_dev/IPv4
d.add InterfaceName $tun_dev
set State:/Network/Service/openvpn-$tun_dev/IPv4

d.init
d.add ServerAddresses * $ns
set State:/Network/Service/openvpn-$tun_dev/DNS
quit
EOF
}


down() {
tun_dev=$1
sudo /usr/sbin/scutil << EOF
open
remove State:/Network/Service/openvpn-$tun_dev/IPv4
remove State:/Network/Service/openvpn-$tun_dev/DNS
quit
EOF
}


case $1 in
up ) up $2 ;; # openvpn will pass tun/tap dev as $2
down) down $2 ;;
* ) init ;;
esac