The 'un-carrier' has an interesting deal for families that will become available tomorrow. Basically, as a family you can get four lines for $120 per month total, and each one of those gets 6GB of monthly data. Adding another line (over 4) is $20 more per month.
What's more, for every one of those lines you can receive a Samsung Galaxy On5 for free (except sales tax, which you still need to pay). That's a $140 value for every one of those phones.
If you go with the $160 per month plan for four that gives everyone 10GB of data (and costs $30 for each additional line starting with the fifth), you each get a Samsung Galaxy J7, which normally sells for $240.
If you're interested, you need to visit this website starting tomorrow, July 13.