How do messaging credits work?

Every plan includes credits each month: Free 400, Community 1,500, and School and District 2,500. One credit is one cent. An email costs 1 credit and a text costs 3 credits per 160 characters. Reminders, messages to volunteers, and renewal reminders use credits. Newsletters, including the ones you start from Campaigns, are free. See your balance in Settings, under Credits, where you can also turn on Auto refill so a send never fails. Buy a credit pack under Settings, then Billing.