How do you count the number of SMS sent?
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We count all messages that were sent successfully to a phone number. The number of accesses (actual access code activations) are usually lower than the number of SMS sent, becuase of mistyped numbers, delayed messages (especially with roaming users), and non activated codes.

How can i buy more SMS credits?
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You can click on Buy More link from the Control Center > Manage > Locations > click on name > search for the ‘Access Meter’, the link will be there on the right.