Text messaging service for Android, textPlus has just been upgraded to support Facebook integration to allow users to connect Facebook friends with textPlus accounts. The integration of Facebook accounts and textPlus accounts will notify users when their existing Facebook friends join the service. Additionally, voice note support has also been added to the application, allowing users to send voice notes to anyone in the US, even if they don’t currently use textPlus. textPlus also integrates your phone’s text message inbox with its own interface for seamless use.

While many applications on the Market offer free text-messaging from an email address, textPlus is unique in that it provides users with real phone numbers that they can share with their friends to contact them on. Upon the first launch, textPlus scans the user’s contact list to determine whether or not existing phone numbers are associated with textPlus accounts.

Cross-platform support means that for those of you wi-fi tablet users, textPlus would provide your device with a phone number for others to contact you with. And because textPlus stores messages in the cloud, the application will remain synced between multiple devices. Unlike Google Voice, another popular text messaging alternative, textPlus bring support for picture and group texting.

Best of all, textPlus is free.

You can find textPlus on the Android Market here.