How to update iPhone applications by using iTunes in your PC?

As you may noticed that update iPhone applications by using 3G is expensive, so why not look for a free-of-charge solution?

That is, update your iPhone applications by using iTunes in your PC.

It's easy:

1. Run iTunes with your iPhone connected to your PC.
2. Go to the "Library" -> "Apps". If you see something like "Apps 3", means there are 3 outdated applications in your iPhone or your iTunes records.
3. At the bottom of the "Apps" screen, there is an option for you to check for updates.
4. Click it and follow the instructions on the screen to complete the updates.