From the Store description:
FIFA 15 Ultimate Team features over 10,000 players from over 500 licensed teams. Plus, over 30 real leagues and stadiums! Build a dream squad of footballers and put them to the test. From the English Premier League and La Liga, to the German Bundesliga and beyond. Take the thrill of football with you wherever you are with the most authentic football game on mobile.
BUILD YOUR ULTIMATE TEAM
Earn, trade, and collect superstars like Lionel Messi and Eden Hazard to create your own fantasy team. Choose your play style, formation, kits, and more.
QUICK SIMULATION MODE
Put your management skills to the test with new Quick Simulations. Set up your squad, start the match, and watch it unfold. Make smart subs, tactical tweaks, and gauge team effort along the way. Your match results depend entirely on your ability to manage player skills and chemistry – taking authenticity to the next level.
REAL WORLD MATCH UPS
Play your favorite team’s next fixture, plus 3 other major match-ups happening around the world – every week!
Use classic controls – now with the “through pass” feature – or opt for new “Casual Controls” with fewer buttons. You can even double tap the joystick to enable tactical dribbling for closer control of the ball. Plus, if you have an external controller – don’t miss the chance to use it on the pitch for the first time.
Jump into the action and feel the passion of your favorite sport with FIFA 15 Ultimate Team!
You'll get an idea of the various game modes from the official screenshots and promo video:
And here's the promo video, for the fuller Xbox game, and not the phone one, but you'll get the idea. It's definitely more management than arcade action: