IPhone 5 :: Siri Only Works With Headphones

I have an iPhone 5 64 gig gsm, factory unlocked phone. Siri only works with headphones or when you use raise to speak. When I attempt to use it without it doesn't seem to hear me. I read a few threads on the subject and it seems this is a known issue. Most of the time the threads end when someone finds a solution without the solution being disclosed. Apps like Soundhound and Shazam seem to work fine so it appears the issue is software related. I have notice Apple texting does not work with the mic either.Â