# `Chimeway.Rendering.Channels.Sms`
[🔗](https://github.com/jonlunsford/chimeway/blob/v1.0.0/lib/chimeway/rendering/channels/sms.ex#L1)

Validates the durable SMS render contract.

Only the message body is a render concern. Sender ID, Messaging Service SID,
and recipient phone number are adapter-config territory — never in render_data.

GSM-7 encoding supports up to 160 characters per segment; UCS-2 (unicode) supports
up to 70 characters per segment. Multi-segment messages are billed per segment.
Segmentation and encoding are vendor concerns handled in the adapter, not validated here.

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*Consult [api-reference.md](api-reference.md) for complete listing*