Join Date:Joined: Oct 2013
my brother has my old s3 i747(rooted, CM10.2) and is on straight talk. took hours on the phone with them to get it set up. for some unexplained reason, they told him to never enable wifi(?).
anyway, did you check settings>wireless>more>mobile networks>APN,and make sure straight talk box is checked? just an idea.
err on the side of kindness