SMS Campaigns for Call Centers: Compliance, Cadence, and What Actually Converts

Last updated: March 2026 | Reading time: ~24 minutes You run an outbound call center. Your agents dial 400 leads a day and talk to maybe 60 of them. The other 340 go to voicemail, get screened, or just don't pick up. Meanwhile, those same 340 people will read a text message within 3 minutes of receiving it. Ninety percent of them. That's not a marketing stat someone made up — it's been replicated across dozens of studies and it holds in 2026. SMS is the channel your call center is probably ignoring or doing badly. And I get why. The compliance landscape is a minefield. The carrier registration process is annoying. And most call center managers came up in a voice-first world where "omnichannel" meant they also sent emails nobody read. But the numbers are too good to keep ignoring. SMS open rates sit at 98%. Response rates hit 45%. Click-through rates average 19% — compare that to email's 2-3%. And when you pair SMS with voice in a coordinated cadence, conversion rates jump in ways that