STS is provided for English and Spanish speakers. It is important to note that STS is not a translation service. STS calls are made for English to English speakers or Spanish to Spanish speakers. C.A.s are not translators. They revoice, not translate.
All relay services have a customer service department.
Customer service may be offered by the individual relay in your state, or by a separate department through your relay's provider. Your customer service staff may be able to give you a lot of information about TTY or STS Relay, and about their services. Some relay services allow you to set up a timesaving customer profile. You can learn how to make long distance relay calls using your long distance carrier of choice, or to make a relay call with a phone card. If you don't know what HCO or VCO is, the customer service staff will educate you.