Hey Kara,
We don't currently offer using voice calls and SMS using the same number. I was looking around and I did see that someone has submitted an Idea to the Genesys Cloud Product Ideas Lab and it is currently listed as Upcoming Development.
If you click the VOTE button on that page, it should notify you via email as this Idea progresses through development.
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Jason Kleitz
Genesys - Employees
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