Hi Louis. Unfortunately, this is currently not supported, since the grammar used intentionally only accepts digits. However, IMO allowing the star (*) key - and probably also the hash/pound (#) key - seems like a reasonable enhancement, and I have created the following SCR for it: VX-886. As far as when this might get addressed, that will be up to Product Management; if you have more information on your business need for this, I will pass it along to the appropriate product manager. Thank you.