Good old SMS are still working like clockwork in marketing, including pay-per-call. Perceived equally well by consumers of all age groups and across industries, text messages have incredible conversion power if they hit the inbox without being blocked by the gateway or carrier.

High SMS deliverability – as close to 100% as possible, but no less than 98% – is at the core of successful text campaigns. No matter how brilliant your message is, you must deliver it first and ensure it's formatted correctly so the recipient can see it.