SMS Marketing Costs Surge 28% as Carriers Tighten 10DLC Rules

For two years, savvy DTC operators treated SMS marketing as the last great underpriced channel — open rates near 98%, click-throughs that embarrassed email, and CPMs that made Meta buyers weep with envy. That era is getting more expensive. A wave of 10DLC (10-digit long code) carrier enforcement actions, rolled out aggressively by AT&T, T-Mobile, and Verizon since Q1 2026, is squeezing message throughput, triggering deliverability penalties, and adding compliance overhead that’s pushing effective cost-per-send up an average of 28% year-over-year, according to data compiled by SMS platform Postscript from 4,200 active merchant accounts.

The shift is forcing Shopify and DTC brands to rethink their SMS program architecture — from list hygiene and campaign cadence to which platforms they trust to route their traffic.

What Is 10DLC Enforcement and Why Is It Hitting Merchants Now?

10DLC is the carrier-mandated registration system requiring businesses to register their brand and individual messaging campaigns with The Campaign Registry (TCR) before sending commercial SMS at scale. While the framework has existed since 2021, enforcement was historically inconsistent. That changed in January 2026, when all three major U.S. carriers began automatically filtering — and in some cases blocking — unregistered or improperly registered traffic without warning.

The practical result: merchants who hadn’t fully completed campaign-level registration (not just brand registration) started seeing deliverability drop 15% to 40% on promotional sends with no error notification from their SMS platform. Some brands only discovered the problem when abandoned cart recovery sequences stopped recovering carts.

“We had a client doing $2.4M a year in SMS-attributed revenue who lost three weeks of cart recovery flow performance before anyone caught it. Their Postscript dashboard showed sends completing fine — the filtering was happening downstream at the carrier level,” said Zach Stuck, founder of growth agency Homeroom, which manages SMS programs for over 60 DTC brands.

💡 Article Summary

Key Insights

1

What Is 10DLC Enforcement and Why Is It Hitting Merchants Now?

2

Which SMS Platforms Are Handling Compliance Best?

3

How Much Are Costs Actually Rising and Where?

4

Should DTC Brands Consolidate SMS Under Their Email Platform?

5

What Changes Should Merchants Make to Their SMS Programs Right Now?

Source: Ecommerce Times

The TCR registration process now requires merchants to specify use-case categories, opt-in language, sample message content, and website URLs for each campaign type. A brand running separate flows for welcome series, abandoned cart, post-purchase, and promotional broadcasts technically needs a registered campaign for each use case — a requirement many operators and their agencies missed entirely.

Which SMS Platforms Are Handling Compliance Best?

Platform response to the enforcement wave has varied significantly, and merchants are benchmarking their providers hard right now.

Postscript, Klaviyo SMS, Attentive, and SMSBump (now part of Yotpo) are the dominant players for Shopify operators. Industry sources indicate Attentive has been the most proactive on compliance infrastructure, having built automated TCR campaign submission workflows directly into its onboarding and campaign creation flows as early as Q3 2025. Postscript rolled out a compliance dashboard in February 2026 that flags unregistered campaigns before they send. Klaviyo SMS, which many merchants use to consolidate email and text under one platform, has been slower — its compliance tooling lags Attentive’s by at least one product cycle, according to agency operators interviewed for this story.

• Attentive: Automated TCR campaign registration in-platform, proactive deliverability monitoring by carrier, dedicated compliance support tier for brands over 100K subscribers
• Postscript: Compliance dashboard launched February 2026, manual campaign submission workflow, strong Shopify Flow integration for suppression management
• Klaviyo SMS: Unified email+SMS reporting remains the key advantage, but compliance tooling requires more manual configuration — agency operators recommend pairing with a compliance consultant for lists over 50K
• SMSBump/Yotpo: Tight integration with Yotpo Reviews and Loyalty makes it compelling for brands already in the Yotpo ecosystem; TCR tooling is adequate but not best-in-class

“The platform you pick matters less than whether your agency actually audited your TCR registrations at the campaign level. Most brands have brand registration checked off and think they’re done. They’re not,” said Gabrielle Tenaglia, director of retention at Portland-based agency Common Thread Collective.

How Much Are Costs Actually Rising and Where?

The 28% average cost increase Postscript cited reflects several compounding factors, not a single fee hike. Breaking down the components:

• Per-message carrier fees: Carrier passthrough costs for 10DLC traffic increased approximately $0.003 per outbound segment in 2026 — small in isolation, but material at volume. A brand sending 2 million messages per month absorbs roughly $6,000 in incremental monthly cost before platform markup.
• Deliverability-driven list churn: Merchants experiencing filtering events are seeing unsubscribe rates spike 2x-4x during the weeks their campaigns are improperly routed, because consumers receive duplicate messages or delayed messages in clusters when traffic is retried. This accelerates list decay and raises the effective cost-per-delivered-message.
• Compliance overhead: Brands using agencies are absorbing 3-8 hours of billable time per quarter for TCR audit and campaign re-registration as use cases evolve. At standard agency rates, that’s $450–$1,200 per quarter in soft cost.
• List hygiene investment: Deliverability pressure is forcing brands to invest in more aggressive list pruning tools. Platforms like Wipeout and Data Axle are seeing increased inbound from SMS operators looking to scrub inactive or carrier-flagged numbers before they trigger spam complaints that elevate a brand’s TCR risk score.

For brands running SMS as a core retention channel — generating 15%–25% of total revenue — the math still works decisively in SMS’s favor. A well-run program at a $30M DTC brand typically returns $18–$25 for every dollar spent on the channel, even after the cost increases. But thinner-margin operators and brands earlier in their SMS program development are recalibrating budget allocations.

Should DTC Brands Consolidate SMS Under Their Email Platform?

The question of whether to run SMS inside Klaviyo (unified email+SMS) versus a dedicated SMS platform like Attentive or Postscript has sharpened as compliance complexity increases. The unified-platform argument — one dataset, one journey builder, one attribution model — is genuinely compelling for brands under $10M in annual revenue that can’t justify managing two retention platforms.

But operators at scale are increasingly landing on a split architecture: Klaviyo handling email and owned data infrastructure, with Attentive or Postscript handling SMS independently, syncing subscriber data via native integrations. The reason is deliverability specialization — dedicated SMS platforms have carrier relationship teams and real-time throughput monitoring that general marketing platforms haven’t replicated yet.

“We moved three clients from Klaviyo SMS to Postscript in Q1 specifically because of deliverability visibility. Klaviyo’s reporting tells you a message was ‘sent.’ Postscript tells you it was delivered, to which carrier, and what the estimated filter rate was. That granularity matters when you’re troubleshooting a $40K promotional window,” said Stuck.

What Changes Should Merchants Make to Their SMS Programs Right Now?

Operators who have spoken with their SMS platforms and audited their TCR status are coming away with a consistent action checklist. Across agency recommendations and platform guidance, the priority list looks like this:

• Pull your TCR campaign registration report from your SMS platform and verify every active flow type has its own registered campaign — welcome, cart abandonment, browse abandonment, post-purchase, and each promotional category you run
• Audit opt-in language at every collection point (pop-ups, checkout, landing pages) to ensure it matches the exact language submitted to TCR — discrepancies are a leading cause of carrier filtering escalations
• Implement a 90-day sunset suppression for subscribers who haven’t clicked or converted in that window — carrier spam complaint rates above 0.3% can trigger brand-level TCR risk flags that affect all your campaigns simultaneously
• Run a carrier deliverability test before your next major promotional send using tools like Sinch’s Message Deliverability Checker or Twilio’s number lookup API to identify numbers likely to filter
• Renegotiate platform contracts now if you’re on per-message pricing — several platforms are offering volume commitment discounts in Q2 to lock in retention-sensitive merchants

Brands that get their compliance infrastructure in order before summer promotional season are best positioned. Prime Day, Back-to-School, and the early Q4 ramp all generate outsized SMS revenue for DTC operators — and merchants who discover a TCR registration problem during a peak send window have very limited options for fast remediation. TCR campaign approvals currently take 3–10 business days once submitted correctly.

Is SMS Still Worth the Investment Given Rising Complexity?

The channel’s fundamentals haven’t changed. Consumers still read texts faster than emails, the purchase intent of someone who opted into a brand’s SMS list is materially higher than a retargeted social audience, and abandoned cart recovery via SMS still converts at 2x–4x the rate of equivalent email sequences for most product categories.

What has changed is the operational discipline required to run the channel well. SMS in 2024 was forgiving — you could build a list, fire off campaigns, and the volume covered for compliance gaps. In 2026, the carriers have effectively raised the floor on operator competence. Brands that treat SMS like a batch-and-blast email list will see their deliverability erode and their costs climb. Brands that invest in list quality, proper registration, and platform tooling will maintain the channel economics that made SMS so attractive in the first place.

For most DTC operators above $5M in annual revenue, that investment is straightforward to justify. The real risk is smaller brands that deprioritize the compliance work and quietly watch their best retention channel degrade without understanding why.