I use an app called textPlus Free. It does free texting over wifi or data and gives you a free phone # to use outside the system. It's on the 1MobileMarket. I no longer use Play and prefer 1Mobile. Everything is free, one click downloads (none of the glitches with insufficient space error or having to click accept and download after you click install) and certain apps not available on Play show up. It's great since I use my tablets more than my smartphone so I can get my texts anywhere, on any device.
Samsung Galaxy Precedent (rooted, AreaRom 3.4 , sd-ext w/ 3.65GB internal space)
Kindle Fire (1st Gen, rooted, AOKP JB 4.1, Nova Launcher)
Samsung Galaxy SIII 4G LTE (rooted, Carbon ROM)