Using Google Voice Help

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http://forums.androidcentral.com – I am going to get a nexus 4 and probably get straight talk for it. I was recently testing google voice out, and I was wondering how people typically go about setting it up on their phone. I know you have it forward calls and texts to your phone, but whenever my phone gets texted it is from some unknown number and has a +1(actual phone number) in the text itself instead of having the actual phone number displaying as the sender. Also, is there any way to integrate GV with the phones built in text and voice interface or do I have to download a google voice app and all that? I was only able to te (HowTos)