SMS credits are your 'currency' for sending SMS (text) messages. Sending one message to a US phone number costs 1 credit. (For example, sending one message to 100 different phones costs 100 credits.) Multimedia messages, which can include more content or images, cost 6 credits to send. You'll need a positive number of SMS credits in order to send any type of SMS message. If you run out of credits at any time before your monthly stipend refreshes, you can always buy more.
It costs credits to interact with your customers and followers, but there are a few occasions where we won't charge you credits: when people text in your mobile keyword to sign up, when they verify their number after entering it on your online sign-up page, or when they text in HELP or STOP.
However, if someone responds to any survey or contest or texts your keyword more than once, each reply or keyword text will cost half a credit (0.5 credits).
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