I am having the same issue. Thus is the email response I received. It doesn't work when I tried myself either. If anyone else can get to work with the instructions please let me know. I can't even find the app in the Google play store either
Hey Mayor, thanks for contacting us.
As I understand that you are getting an error message that "your device is incompatible" while trying to update your game.
However please note that if you've previously been able to play SimCity BuildIt on your Android device, but your Google Play Store is saying your device is 'no longer compatible', we've not recently made any changes that would prevent you from continuing to play! Please follow these two steps which may help get you playing again
Firstly, please temporarily remove, then re-add your Google Account to your device. Here's how:
1) Open the Settings menu on your device.
2) Under "Accounts", touch the name of the account that you want to remove.
3) If you're using a Google account, touch Google and then the account.
4) Touch the Menu icon in the top-right corner of the screen.
5) Touch Remove account.
6) Re-add the account by entering your credentials, then re-open the Google Play Store.
Secondly, please make sure you've updated the Google Play Store app itself and your Google Play Service app
To check your version of/update the Google Play Store:
-Open the settings menu in the Google Play Store app.
-Scroll all the way down.
-Tap on the Build Version section.
-If an update is available it will be here!
We're continuing to investigate into these reports, and are in discussions with Google as to why it may be happening. Thank you for your patience!**
We want to make sure everyone has the best experience possible playing SimCity BuildIt. Sometimes it's not possible for us to support certain devices as their processors or memory would struggle with the graphical intensity of our game. This can also include a modified or 'rooted' device, currently running a higher OS version than is officially available for it.
Sometimes we have to take the difficult decision to no longer support a device that was previously supported, due to multiple crash reports and feedback gathered from our players. Some catastrophic problems only start to appear once a city has grown very large, or a player has been playing for an extended period of time - so even though you may have had a good experience up until now it's very likely that you might have a bad experience in the future, perhaps even losing your entire city. We want to make sure that future players do not experience these issues. These decisions are never easy to make, and we appreciate how frustrating they can be.
We're really sorry that your device is currently incompatible with SimCity BuildIt as we wish everyone could play our game, but we'd also really hate it if you had a terrible time battling with crashing, lag or data loss. If you'd like to start playing on a supported mobile device in the future we'd be more than happy to hear from you again!
http://help.ea.com/en/simcity/simcity-buildit/