SMS, and the 160-character line

• Wikipedia says SMS is a text messaging service that lets mobile phones exchange short text messages, typically over cellular networks.
• It says messages are up to 160 characters, originally for GSM, and that gateways can carry them through an SMSC.
• The article says MMS was later introduced as an upgrade with picture messaging.
• Sinch's SMS overview says you can send and receive SMS, including bulk SMS, and it names the Conversation API, the SMS REST API, and Enhanced SMPP.
• The Conversation API section says the same API can also send RCS, WhatsApp, Viber Business, and Facebook Messenger, and that hosting locations named there are US East and EU Ireland.

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