If you select the BYOMD, meaning you want to Bring Your Own Mobile Device with you when you join Madstar, then depending on your phone you may, or may not, need to buy a Madstar SIM card.
Here is a list of the devices
· LG Google Nexus 5 (Google Play Store edition)
· iPhone 5
· Samsung Galaxy S4 (SPH-L720)
· IPad 4th Gen and iPad mini (1st Gen)
· Nexus 5
· Galaxy S4