Among services that let you bring your own phone, Verizon Prepaid provides the best deals for four lines, thanks to generous multiple-line discounts on its 3 and 7 GB (per line) plans that drop those four-line costs to $100 and $125, respectively. The only exception is the least appealing data amount: four lines with 1 GB each, where AT&T Prepaid is cheapest at $90 a month. Cricket offers more data in our medium-usage scenario—$110 buys you 5 GB per line—but that comes with an 8 Mbps speed limit and no hotspot support.
Metro and Boost charge the same $30 to add extra lines to one of their data plans. That means a family of four would pay the same $140 a month for unlimited data on every line. We give the nod to Metro, because the network of its parent company T-Mobile performs better on our test than that of Boost parent Sprint. We also like its included Google One storage, though Boost offers more hotspot data with its plan.
Just make sure to turn off your cellular and data roaming so you don’t accidentally get stuck with charges. To do that on an iPhone, go to “Settings > Cellular” and click the switch next to “Cellular Data.” Also go to Cellular Data options and make sure “Roaming” is turned off. On most Android phones, go to “Settings > Mobile Networks > Data roaming access” and then click on “Deny data roaming access.”
To make the decision easier, we’ve gone through each carriers’ plans to figure out which one is the best for your particular needs. Even after introducing a lower-cost, stripped-down plan, T-Mobile's T-Mobile One unlimited data offering is the best family plan; it offers better value than AT&T and Verizon (though bargain hunters may be tempted by Sprint's discounted family plan and AT&T includes a new streaming TV service with its unlimited plans). T-Mobile's $70 plan is also the best unlimited data plan for individuals, though you can now get a bare-bones unlimited data plan from the carrier for $10 less.

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