Unlike generic "connection failed" errors, the is specific to SimCity BuildIt’s client-server authentication handshake. When you launch the game, your device sends a "handshake packet" to EA’s servers. Error 1100.7 occurs when the server receives that packet but finds it malformed, expired, or conflicting with a previously saved state.
: If you are using a VPN, disable it. SimCity BuildIt's servers sometimes flag and block certain VPN IP ranges, causing the 1100.7 error. Proposed Feature: "Offline Buffer Mode" Simcity Buildit 1100.7 Error
In plain English: Your game tried to save your progress or load a feature (like the Global Trade HQ or War对战), but the connection was interrupted before the server could say "Confirmed." Unlike generic "connection failed" errors, the is specific