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 ASC LIMIT 1
What is the cell phone number of the student whose address has the lowest monthly rental?
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 ASC LIMIT 1
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 asc limit value
What is the cell phone number of the student whose address has the lowest monthly rental ?