Reference
Detailed reference for how messages are counted, the status and error codes you may see, and how opt-out requests are handled.
SMS message parts
Why long messages and emoji cost more: SMS parts, the 160 and 70 character limits, and the basic and Unicode character sets.
Status and error codes
Every status and error code an Iflow message or job can show, and what each one means.
Opt-outs and the stop list
How Iflow handles opt-out requests automatically, using the opt-out instruction, the STOP keyword and your stop list.