Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE candidates ( candidate_id VARCHAR )
TABLE: CREATE TABLE candidate_assessments ( candidate_id VARCHAR, asessment_outcome_code VARCHAR )
TABLE: CREATE TABLE people ( cell_mobile_number VARCHAR, person_id VARCHAR )

### Question ###
Find the cell mobile number of the candidates whose assessment code is 'Fail'?

### Accurate SQL ###

SELECT T3.cell_mobile_number FROM candidates AS T1 JOIN candidate_assessments AS T2 ON T1.candidate_id = T2.candidate_id JOIN people AS T3 ON T1.candidate_id = T3.person_id WHERE T2.asessment_outcome_code = "Fail"