text: Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
  ### Context:
  CREATE TABLE Students (cell_mobile_number VARCHAR, student_id VARCHAR); CREATE TABLE Student_Addresses (student_id VARCHAR, monthly_rental VARCHAR)
  ### Question:
  What is the cell phone number of the student whose address has the lowest monthly rental?
  ### Answer:
  SELECT T2.cell_mobile_number FROM Student_Addresses AS T1 JOIN Students AS T2 ON T1.student_id = T2.student_id ORDER BY T1.monthly_rental LIMIT 1