My family has several Page Plus phones. Three of these phones have Auto-Refill and, after recently adding a new 'glove-box' phone, I discovered that Page Plus is offering a new discount for Auto-Refill. Some of these discounts are as much as 16%! Even if you already have Auto-Refill on your plans, you can delete the old refill, re-add it, and you'll get the new price.
Page Plus is an America Movil Prepaid and offers some of the lowest-priced plans for both Pay-As-You-Go and Monthly plans, including Data. They occasionally offer Auto-Refill discounts on other America Movil accounts, but you may miss it, especially if you already have Auto-Refill. We don't get any compensation for this tip (although we do offer Discount Page Plus Refills at Mountain Prepaid), but the more popular these deals are, the more Page Plus can afford to do these promotions.
If you have an old Verizon phone, Page Plus is one of the least expensive ways to maintain a second or low-cost wireless account. While Page Plus charges for roaming off the Verizon Wireless network, that rarely happens, and some Prepaids don't allow off-network roaming at all.