Star Traders RPG (Lite)
aka Free Version, download here.
Likes: Playable with Lite version; lots of playing styles.
Dislikes: Unable to determine a good trade route - all prices seem to the same; steep learning curve; good things on Elite (paid) version; poor documentation on combat; can't frick'in land on a planet as encounters keep coming; the next ship is way too expensive.
Joran: There are many trading games. This seems the best by far, for a mobile version. There's a large range of playing styles to choose from: from Mr Jack, to Bounty Hunter, to a Spy (in paid version). However, it suffers from what I feel are many flaws, which I've listed above.
I've not won a single game on Normal to Challenging difficulties yet. However, I'm making progress. It's flawed, but I think I can make it as a bounty hunter. Just don't offend anyone, till you get permits from most of the factions.