Xperia Ion (I cant hear and people have issue hearing me)

[The_ga_heretic]

So my phone is through Straight Talk and i purchased it used. I cant hear my phone dial out or ring when making a call (but call will go through). When i talk on Tango i can hear and people can hear me. Tho they say my voice goes out and then comes back in REALLY loud.

What might the problem be?