Seems on my phone when I'm in the OT I am not able to do word studies does anyone else have this problem?
Hi Joe, and welcome to the forums. You can, but only if you are using a version that has a reverse interlinear. I suspect you are trying it with the NIV, and I don't think there is a reverse interlinear for that yet. If you change to a version that does, like the ESV, a word Study should work fine, in the same way as you can do for the NT (except you'll get Hebrew, of course!)
Joe - Welcome to the forums!
Greg is right - to look up Hebrew words from an English bible, it must have a reverse interlinear. The ESV has an RI for both OT & NT, and as Greg said, the NIV is currently limited to the NT.
By the way, there is a forum for iPhone/iPad related questions HERE.