I had purchased three FreedomPop SIM cards on sale at Best buy for $.99 each last month, and I finally got around to activating them! I now have five SIMs on the 200mb plan and can interchange them during the month when they run out.
Here is my current phone situation:
Phone: Samsung Galaxy S7 Active (got it for free from a friend)
Backup phones: Nexus 4 (Soooo much fun to toy around with but not very practical) and LG Volt
Plan: Google Voice + 1000MB FreedomPop data per month (5x SIM cards)