You pay for outbound messages only. This includes auto-responses, single text messages, system text messages, STOP or START text messages, and group or entire list text messages.
Standard Text Messages (SMS)
Standard text messages are one (1) credit. You can send up to 160 characters with no images. If you send it to 100 people, you will be charged for 100 text messages.
Enhanced Text Messages (MMS)
Enhanced text messages are two (2) credits. You can send up to 300 characters with/without an image. If you send it to 100 people, you will be charged for 200 text messages.
Call forwarding and voicemail are charged (1) message credit per minute.
Prices are subject to change at any time. Monthly credits expire monthly, and yearly credits expire yearly. If you purchase additional credits, those never expire (only if you cancel).
Please note: If you're on a shortcode, you'll pay for both incoming and outgoing messages.