# Programmable SMS

- [Send an SMS Message](/api-reference/programmable-sms/send-an-sms-message.md)
- [Receive an SMS Message](/api-reference/programmable-sms/receive-an-sms-message.md)
- [Delivery Receipts (DLRs)](/api-reference/programmable-sms/delivery-receipts-dlrs.md)
- [SMPP](/api-reference/programmable-sms/smpp.md)
- [Headers](/api-reference/programmable-sms/smpp/headers.md)
- [Errors](/api-reference/programmable-sms/smpp/errors.md)