Texting app for a tablet (I searched but not having luck)

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http://forum.xda-developers.com – I am having trouble finding the info I am looking for. Probably because I dont know exactly what I want in a searchable way. My wife does not have a cell phone .. she has been using textfree by pinger. I would like to find some kind of program that can send and receive google voice texts just like a normal cell phone on her tablet. She doesnt get her texts until she refreshes it. I want one that when a new text comes in will alert her. Anyone know of something that will work for this? I have tried a couple without much luck. Let me know. Thanks And sorry if this is something I should ha (HowTos)