CREATE TABLE table_30099 ("Branding" TEXT, "Callsign" TEXT, "Frequency" TEXT, "Power kW" TEXT, "Coverage" TEXT)

Name the callsign for davao mindanao region
SELECT "Callsign" FROM table_30099 WHERE "Coverage" = 'Davao Mindanao Region'
SELECT "Callsign" FROM "table_30099" WHERE "Coverage" = 'Davao Mindanao Region'