There are two models of the Garmin 120 out there, The earlier model runs software version 3.** and will not allow texting. The newer models run software version 5.** and has the texting capabilities. If you go to Garmin's web page they will allow you to do software upgrades, but you can not upgrade the earlier model to allow texting.
I have both models of the 120 and two 530's. the 530's are awesome radio/gps units and we use them in our group. One note about texting, You need a strong signal to send or receive a text message.