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Because of Apple policies, the VoIP software can use WiFi connections only and not 3G.
In other words you can not make skype calls on the road.
In order to do it, this is what you need:

1-Your iPhone must be jailbroken, if it’s not, read this.
2-Install your Skype or Fing app from the App Store.
3-Install 3G Unrestrictor from Cydia.
4-Open 3G unrestrictor and add the desired applications (skype, fringe, whatever you want)


Ready

By defult the Skype iPone App does not support Video.
But there is simple workaround: Use Fringe.

First you must have a
account

Then from your iPhone go the App Store, search fring and install it.
Open the fring app to open a fring account.

Ready now you have skype with video.

Celular rates are expensive everywere and international fees too.
So, how to make cheap international calls from your iPhone?
Simple, use


Click this link and get Up to 10,000 calling minutes to landlines for one low monthly fee – the new Skype calling subscriptions.

This method is deprecated
Use This other method instead to sync iphone and ubuntu

http://www.mexlinux.com/how-to-sync-music-between-iphone-and-ubuntu-using-new-ifuse/

OK, now is beginig to be possible to sync your music from Ubuntu to your iPhone, thanks to the work of marcan and many others.

Disclaimer: This is very Alfa software, I didn’t invented any of the things I’m writing about, I just adpated the marcan instructions in the way they worked for me, to my personal systems, wich I’m sure many are using: Ubuntu Karmic Koala 9.10 and iPhone 3G with OS 3.1.2, by the way you need to have some music synced by iTunes before you can start.
Don’t cry if your iPhone melts:

1- update your system, either via synaptic or with

sudo apt-get update

sudo apt-get upgrade

2- Add the PPA repository with the needed packages :

deb http://ppa.launchpad.net/jonabeck/ppa/ubuntu karmic main

Either adding it as root to your /etc/apt/sources.list file

Or with the GUI “Software sources”

Then add the key for the repo with this command:
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com F0876AC9

And update again with:

sudo apt-get update

3- Install the packages required for compilation, and the already packaged libraries:

sudo apt-get install git-core cmake autoconf libtool libglib2.0-dev intltool gtk-doc-tools libsqlite3-dev libxml2-dev  libiphone-dev libplist1 libusb-1.0-0 libusb-1.0-0-dev libusbmux0 libusbmux-dev ifuse libiphone0 libplist0 libplist-dev

4-Get the libgpod code and compile it:

$ git clone git://gtkpod.git.sourceforge.net/gitroot/gtkpod/libgpod
$ cd libgpod
$ CFLAGS=”-g -O0″ sh autogen.sh –prefix=/usr
$ make
$ sudo make install

5-Create a folder to mount it, and mount it:

sudo mkdir /media/ipod

**connect your iPhone**

sudo ifuse /media/ipod

6-Create the needed directory and files:

cd /media/ipod/iTunes_Control
mkdir Device

Find your UUID with

lsusb -v | grep -i iSerial

grab your UUID wich is the 40 characters long text
and run the following command replaceing with yours:

ipod-read-sysinfo-extended /media/ipod

This has generated a needed file into the Device folder.

7-Thats it. Now you can open the gtkpod application and sync your iPhone.

Notes:
In order tu unmount your iphone first dissconect it via gtkpod and the you can use

sudo umount /media/ipod

And to mount it again just

sudo ifuse /media/ipod

I don’t have any religion, and never will but if for some reason I would have to have one I guess I will be buddist, Buddishm is a doctrine, not a dogma, not a magic revelation provided from a supernatural being…

Just compare these two phrases:

“He who is not with Me is against Me”
-Jesus Christ

“When I speak to you, do not accept what I say in blind faith out of respect for me.
You must examine all that I say, think hard and long, and put it to the test,
just as a goldsmith examines gold by cutting and heating it to know whether it is genuine gold.
If you have doubts, test it out. If you find it is right, accept and follow it.
If you find that it is flawed then examine why and think it through.
Only when you know how it is flawed can you say so, and only when you know how it is right can you follow it.”
- The Buddha

The buddhism even has some kind scientific method applied. While the rests mean only intolerance.

There is a way to sync your files in the iphone, and also shering not only with ubuntu, but also with Windows or Mac.

It’s a free service called dropbox that offers 2Gb of space for your files.

1-Click here to go the dropbox website and create a free account.

2-Click on the Install link to Download dropbox and install it on your PC, there are versions avilable for Ubuntu, Fedora, and Sources (there are also Windows and Mac versions).

3-On Your iPhone go to the Apple Store and search for dropbox and install it.

4-Now You have a Dropbox folder in your PC, and a Dropbox app in your iphone. Any file that you copy to your Dropbox folder will appear on your iphone, and viceversa.

Have fun!