Madden Mobile on iPhone6

@Toviel_k 

Does it have iOS 10 or newer? Make sure it has the latest software update.

It meets the requirements but I recommend lowering the video settings in game since your device is on the minimum requirements side of running the game.

The game isn’t working on my device

Because of the new graphics and gameplay engine, Madden NFL Mobile has higher minimum requirements than previous seasons of Madden NFL Mobile.

You’ll need a device with OGLES 3.0 and 1G RAM to play. That means it will have specs equivalent to the Samsung Galaxy S5 or newer for Google Play devices, or an iPhone that supports iOS 10 or newer.

If your device can run the game, make sure you have the most up to date version of it:

• Apple App Store: Go to the App Store on your device, then tap the Updates tab on the bottom bar. Find Madden NFL Mobile in that list and tap Update.
• Google Play: Go to the Google Play Store, then go to My Apps. If there’s a newer version of Madden NFL Mobile, it will say Update Available.

Amazon devices are not supported for Madden NFL Mobile.

Is the game crashing?

If your mobile device meets the requirements but your game is still crashing, you can try lowering the Quality settings in the game’s menu:

1. Tap the menu icon (the three lines on the top left corner of the main menu).
2. Tap the Settings cogwheel.
3. Tap Edit next to Preferences.
4. Under the Visual section, drag the Quality setting down to a lower setting and see if your game stops crashing.

If you don’t have the option to adjust the Quality settings, then your device is most likely on the lower end of the minimum requirements.

https://help.ea.com/en-us/help/madden/madden-nfl-mobile/get-help-in-madden-nfl-mobile/