Don't want to deviate from the topic, but there is free Wireless service called as Freeupmobile -- which is an MVNO based with services from AT & T, good for anyone with a spare device or for kids..
Cost is basically $0 !!! Comes with 500 minutes or texts and 100MB data, good for kids or spare devices. Using it on my spare iPhone.
Please note that I am NOT promoting or advertising anything here, just mentioning a free service available (till God knows when it's free or in service - many may still remember the RingPlus )