Truphone today introduced full two-way instant messaging over MSN Messenger, Yahoo! Messenger and Google Talk on the iPod touch™ and also announced that availability on the iPhone would begin the week of Jan. 12.

Customers can also make and receive voice calls on Google Talk; calling functionality will be added to MSN Messenger and Yahoo! Messenger in the coming weeks.

Truphone has also integrated Twitter into the TruFriends view so users can see what friends are talking about and post from within the Truphone application.

“We understand that customers increasingly want more integrated communications and like to switch between chat and voice,” said Truphone CEO Geraldine Wilson. “With these new features, Truphone customers can now choose which mode of communications they want to use at any moment—all from within the one application. This represents another step towards making Truphone the open ‘all-in-one conversations hub’ for iPhone and iPod touch users.”

The introduction was made at “ShowStoppers @ Macworld 2009” and will be showcased at the Truphone booth (#3228) at Macworld for the remainder of the week.

Separately, Truphone also announced today the introduction of Skype calling and instant messaging when using the Truphone application on the iPhone and iPod touch.

Customers of Truphone for both the iPhone and iPod touch can now very simply import all their contacts from these accounts to Truphone and chat with them from the Truphone interface. The Truphone client on both devices shows who is online with its built-in presence functionality.

Instant messages are always free of charge to send and receive when in a Wi-Fi environment. iPhone users can also instant message when out of Wi-Fi range; data charges will be covered in the customers unlimited data package*. Truphone will also add the same functionality to other leading instant messaging services throughout the year.