idle rainy day pondering - cheapest way to have a phone number + a little data for a backup iPhone?

[ztirffritz]

I have a FreedomPop Wifi Hotspot that includes 250mb of data every month. I also have have a FreedomPop SIM in my 5S with unlimited calling for free every month. On the phone I'm paying for I think 2GB of data, but it's about $12/month. If you work the system you can get more data for free, but it isn't worth it to me. I paid extra to get a global SIM so I was able to use it while I was in Italy. My wife talked to her girlfriend while we were hiking in Cinque Terre. The customer service isn't great, but it mostly works without issues.