I originally played this game to death on my TG 16, then on the PlayStation (Nectaris). I found out about the mobile version of the game and got it for my Sony Ericsson w600i. I love it - a great diversion that is easy to pick up and put down whenever I'm waiting in line for something.
Here are the differences I've seen from the TG 16 version:
1) The computer AI, while mostly intact, sometimes doesn't act when he should. For instance, level 4, after he took out his Hadrian from the factory he never did anything with it. Same with his tanks, he never closed in or set up any kind of offense. He normally shells my people from just over the mountains, and tries to push his way into the center terrritory.
2) The after battle report is missing the nice graph.
3) No battle animations.
4) The computer is less aggressive with their Kilroys - sometimes doesn't act with them when they should - see #1.
5) They are smarter with their Hunters - they actually picked my Hawkeyes as a primary target instead of my nearby Charlies (level 5).
6) No operation map, just a text selector that lets you jump to a level you have already completed.
7) You can save at any time!
The overall battles seem a little more forgiving. Remember all those Polar tanks that are supposed to have high defense? They actually feel that way now.
9) Some spelling mistakes in the unit library - The "Falcon" is referred to as the "Falco" and the "Titan" has been renamed to the "Monster"
10) Hadrians are a little more accurate. It seems in the TG 16 version, a full company of Hadrians attacking a full company of Bisons would usually only hit one or two. Now I typically hit 3 or 4. Maybe it's just me though.
There's probably more... I'll post an update if anyone cares. I am basically using the strategies that work the best for me on each map, and am seeing how the mobile computer reacts compared to the TG 16 computer.