First released for Android way back in early 2011, Line2 lets its users make phone calls and send texts using only a data connection -- no carrier minutes or texts required. True to its name, it gives subscribers a second phone number that the app uses for sending and receiving calls and texts.

The latest update enables picture messaging (MMS), and adds support for Android tablets. Even over a slow DSL connection, call quality was surprisingly good on my Nexus 7. The revamped UI is a welcomed addition as well; it matches Android's Holo design quite nicely.

Free accounts can only make calls and send texts to other Line2 users (incoming voicemails and texts can still come from anywhere). For a fully functional experience, a subscription fee of $9.95 a month is required. This buys you unlimited calls and texts to the U.S. and Canada, along with a host of other goodies like call forwarding and visual voicemail.

Hit the Play Store link at the top to check it out Line2's latest version.