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Hi Susan,
The way that mobile carriers bill SMS is per "segment" or what they consider a message. Often these segments are combined to appear as one message on a mobile device (or in the RingCentral app).

The way segments are defined is a little complicated, as it is based on numerous factors including the type of characters being used (this impacts encoding type), the number of characters, and if additional headers (meta data) is required.

More information including examples of the character sets, and how segments are defined and billed is available here:

https://support.ringcentral.com/article-v2/Character-limits-for-text-messages.html?brand=RingCentral&product=MVP&language=en_US

In terms of the 0.013 cost that you are seeing, that is likely a MMS message (includes an attachment such as a picture). MMS is also billed differently than SMS, but gives you more flexibility and the ability to include more characters in a single message.

I hope this helps and if you have any questions please do not hesitate to let me know,
Mike