Go to Settings / Wi-Fi, and click on the "arrow" icon on the right-hand side of the active connection. In the next screen you'll get a number of network properties, among which is the current IP address.

Just tap on the top bar of the screen, the one that shows the carrier name and the current time, and the page will scroll right at the beginning.

Double tap an image to zoom it. Double tap again on it to restore the previous zoom level.

You can use the MobileChat application to chat with Mac users. Please refer to this FAQ for more information about this application.

You can use the MobileChat application to chat with AOL users. Please refer to this FAQ for more information about this application.

You can use the MobileChat application to chat with ICQ users. Please refer to this FAQ for more information about this application.

There is no built-in chat application on the iPhone, but there are a few third party alternatives. Our favorite one is MobileChat, which works with the latest firmware.

You can install it on your iPhone through the Installer module, after adding the content source that points to http://twenty08.com/installer

Once installed, launch it and you'll be prompted to login with your MSN, AOL, ICQ or .Mac account. Once logged in, you'll see your contacts and will be able to chat with them, or add new contacts. The application also supports landscape mode, popup/vibrating/sound notifications, and the ability to change its appearance by installing different themes.

At the top of the screen, on the right side of the carrier name, you might see a square or an "E". If you see a square, it means there is GPRS coverage. If you see an "E", it means there is EDGE coverage. In both cases, when the icon is blue instead of white (in the standard theme) it means there's an active data exchange - according to your data plan this might be sucking money or not.

Provided that your SIM has a data plan enabled, you can use EDGE to connect to the Internet when a wi-fi connection is not available.

Go to Settings / General / Network / EDGE, and provide the APN, username and password settings. You should be able to retrieve these settings from your carrier's website, or through their tech support.

When you launch Safari or other applications that need an Internet connection, the iPhone checks if the wi-fi is on and if it can connect to a network; if it can't, it automatically uses EDGE. If you don't have a flat data plan on your SIM card, this could easily consume all your credit!

To permanently disable EDGE, go to Settings / General / Network / EDGE, and type a wrong value for the APN setting; this way the iPhone won't be able to connect to a valid EDGE connection.

If you want to disable EDGE just temporarily, and be able to easily re-enable it at any time, download Boss Prefs through the Installer application, then launch the new application and use the switch to enable/disable it.