What Does the SIM Card Do on 3.0 Phones? Jason L Environment All Republic Wireless 3.0 phones Answer The SIM card is needed for activation and used to maintain connection to the cellular service. Additional Notes Not used for contacts or storing personal information Article Created From 1200069 Related articles Can I Use the SIM Card from My 1.0 or 2.0 Phone in My 3.0 Phone? Republic Wireless Phones How to Install the SIM Card in a Samsung Galaxy S6/S7/S7 edge/S8/S8+/Note 8/S9/S9+/Note 9 What Should I Do With a SIM Card I Don't Need? What Does it Mean When the Republic Wireless Arc is Hollow or Solid?