While driving a CMV: Question While driving a CMV: Answers You may hold a cell phone to receive a call. You may send text messages. You may not hold a cell phone to make a call. Explanation While driving a CMV, you may not make voice calls if you need to hold your phone or press more than one button to do so. Additionally, you may not send or read text messages while driving. This questions appears in the following tests: Arizona Class B Knowledge Test Oregon Class A Knowledge Test Rhode Island Class A Knowledge Test Vermont Class B Knowledge Test