best cell phone plans with low roaming charges

Verizon
Verizon: Bring your phone deal | myPlan for just $25/line
https://www.verizon.com/myplan/byod
AdUnlimited Welcome $25/line/month for 4 lines with Auto Pay. Plus taxes & fees. When you bring your own phones. Terms apply.
Ranked Highest in Wireless Network Quality – J.D. Power
Mint Mobile
Mint Mobile Sale | 3-Month Unlimited Plan $15/mo.
https://www.mintmobile.com/plan-sale
AdNew customer offer—get our 3-month unlimited plan for $15/mo. ($45 upfront). Slows 40GB+. It's time to leave your expensive wireless bill behind. Switch to Mint and start saving.

Verizon: Bring your phone deal | myPlan for just $25/line