Database: california_schools (difficulty: simple)
Question: What is the telephone number for the school with the lowest average score in reading in El Segundo Unified?
SQL: SELECT T2.Phone FROM satscores AS T1 INNER JOIN schools AS T2 ON T1.cds = T2.CDSCode WHERE T2.District = 'El Segundo Unified' AND T1.AvgScrRead IS NOT NULL ORDER BY T1.AvgScrRead ASC LIMIT 1