Here is what the bill says:
b. Any parent or guardian of any student may provide such student with a cellular telephone for any lawful use en route to and from school. No person shall interfere with the provision of such telephone to, or the use of such telephone by, such student.For the full text click here.
c. Any person who is aggrieved by interference prohibited by subdivision b of this section shall be entitled to seek equitable relief in any court of competent jurisdiction.
d. Nothing in this section shall be construed to affect or limit the right of any school or law enforcement official to enforce regulations regarding the use of cellular telephones.
The Council approved the bill 46-2 and is expected to override the mayor's veto. Families will then have the law on their side.
InsideSchools has good coverage of the story including press accounts.
UPDATE: The council overrode the mayor's veto to pass this bill into law.