MT4 does not have a native application for MACs. So your only other option is to use or download MT4 on your phone.
For the adventurous traders, you may be interested in using the following application.
Please keep in mind MyForexFunds does not vouch for or support this program so please use it at your own risk.
https://www.metatrader4.com/en/trading-platform/help/userguide/install_mac