Do not attempt to operate your phone charger if it has received a sharp blow, been dropped, thrown from a speeding motorcycle or is otherwise damaged; doing so may damage your phone.Emphasis added.
Composition students are invited to rectify the faulty parallelism.
T-Mobile. Getting Started. TM1524 GH68-18756A. p. 27.
(The MLA guidelines for citing a cell phone user's manual are frankly insufficient.)