In , Error 1100.7 is a critical connection issue specifically identified as an "Additional Content Download Error" . It typically occurs when the game client fails to download necessary assets from the server, such as when unlocking new regions like Green Valley or participating in Club Wars . Common Fixes for Error 1100.7
Offload the app (Settings → General → iPhone Storage → SimCity → Offload App), then reinstall. This keeps your save data. Simcity Buildit 1100.7 Error