Definitions:
Local phone prefix
+420 ·
Expat non-CZ prefix & home_city_id = 271 (Prague) ·
Tourist non-CZ prefix & home_city_id != 271 (or NULL) ·
Unknown NULL phone.
DI% = Bolt-funded campaign spend / GMV (Bolt-only, excludes provider co-fund). Filtered to delivered orders in Prague (city_id 271).