Executive Summary
US mobile carriers and their CSP partners enforce A2P 10DLC rules that go beyond “register once and forget.” Carrier guidelines typically expect verified Brand identity, accurate Campaign use cases, consensual traffic, functional STOP/HELP, and avoidance of evasion techniques such as snowshoeing. Provider documents (for example Bandwidth’s T-Mobile 10DLC article) also describe non-compliance pass-through fee categories for certain Code of Conduct violations. CTIA Messaging Principles supply industry best-practice framing for informational versus promotional programs. This guide translates carrier expectations into an operating checklist without inventing universal MPS or fine schedules.
Short answer: Follow carrier/CSP 10DLC expectations by registering Brand + Campaign, aligning samples to real traffic, collecting verifiable opt-in, honoring STOP, and avoiding evasion. Exact fees and throughput are provider- and carrier-specific—read your CSP’s current docs.
Who This Is For / Who It Is Not For
Who this is for
- Brands sending US A2P SMS on long codes
- Platforms enforcing policy for many customers
- Compliance teams writing SMS standards
Who this is not for
- Teams seeking a single universal fee table
- Non-US domestic-only messaging
Definitions
| Term | Meaning |
|---|---|
| 10DLC | Registered US long code A2P path |
| MNO | Mobile network operator / carrier |
| CSP | Campaign Service Provider |
| Code of Conduct | Carrier messaging rules referenced in CSP docs |
| Snowshoeing | Spreading traffic across numbers to evade filters |
| SHAFT-C | Common prohibited content shorthand in industry docs |
What Carrier Guidelines Usually Cover
Carrier and CSP materials commonly address: Brand/Campaign registration; number association; consent and opt-out; prohibited content; throughput and daily caps; and enforcement for evasion or repeated content violations. Always read the documents your CSP points to for each MNO—AT&T, T-Mobile, and Verizon policies are not identical in presentation.
Registration and Number Association
Unregistered US 10DLC traffic is widely blocked on major platforms. Approval of a Campaign is not enough if production From numbers are not associated. Sole Proprietor paths often allow only one long code—confirm with your CSP.
Consent, Content, and CTIA Framing
CTIA principles distinguish conversational, informational, and promotional messaging. Promotional programs need written promotional consent. Adding coupons to informational texts can reclassify them. Carrier filtering still applies after registration.
Non-Compliance Categories (Provider-Documented Examples)
Bandwidth’s T-Mobile 10DLC documentation lists pass-through categories such as text enablement before ownership verification, program evasion (snowshoeing/dynamic routing/unauthorized number replacement), and repeated content violations. Treat dollar amounts as provider-published and date-specific—not universal law.
Decision Framework
1) Inventory policies your CSP links for each MNO. 2) Map your templates to use cases. 3) Verify Brand/Campaign/number status. 4) Audit consent and STOP. 5) Remove evasion patterns. 6) Document exceptions with counsel. 7) Re-read CSP changelogs monthly.
Requirements Matrix
Risks and Failure Modes
| Risk | Mitigation |
|---|---|
| Ignoring MNO-specific CSP docs | Assign owner to read linked carrier articles |
| Snowshoeing after blocks | Consolidate onto approved Campaign numbers |
| Assuming registration equals consent | Run separate TCPA audit |
| Stale samples vs live traffic | Monthly template sync |
| Unregistered senders in production | Daily error-code monitor |
Implementation Checklist
| Step | Owner | Artifact |
|---|---|---|
| Collect CSP MNO policy links | Messaging admin | Policy binder |
| Audit Brand/Campaign/numbers | Eng | Status export |
| Consent + STOP review | Compliance | Audit report |
| Remove evasion patterns | Ops | Change ticket |
| Re-read changelogs monthly | Admin | Runbook update |
How MyTCRPlus Can Help
Use MyTCRPlus tools to catch packaging issues before submit—not as a substitute for CSP policy pages.
FAQ
Are carrier guidelines the same as TCPA?
No. Guidelines/CSP policies are commercial enforcement; TCPA is law.
Do I need to read every MNO PDF?
Read what your CSP requires; escalate edge cases.
Can throughput differ by carrier?
Yes—e.g., T-Mobile daily caps appear in provider docs.
Is registration enough?
Necessary but not sufficient—consent and content still matter.
What is snowshoeing?
Spreading similar traffic across many numbers to evade limits/filters—high risk.
Where do fees appear?
On CSP invoices as pass-throughs when applicable—confirm current schedules.
Do CTIA rules bind me legally?
Industry best practices; carriers/CSPs may enforce related expectations.
How often do guidelines change?
Periodically—monitor CSP changelogs.
Key Takeaways
- Register and associate correctly
- Align samples to live traffic
- Honor STOP quickly
- Avoid evasion tactics
- Read CSP-specific MNO docs
- Separate TCPA analysis
- Use tools to preflight packaging only
Worked example: applying carrier rules to one campaign
A regional grocery chain registers a Marketing campaign for weekly deals. Under the shared CTIA guidelines, its opt-in must disclose the brand, message type, frequency, fees, HELP and STOP. Under T-Mobile's rules, its traffic counts against a daily cap tied to the brand's vetting score, so the chain applies for secondary vetting before launch. AT&T assigns a per-second throughput class based on the same score.
The chain also checks content against carrier prohibitions: its alcohol promotions require an age gate on the opt-in and the age-gated attribute on the campaign, and it removes a bit.ly link from its template in favor of a branded domain. Verizon's filtering is content-driven, so the chain keeps link domains consistent and avoids sudden volume spikes.
Disclaimer
This article is for informational purposes only and is not legal advice. Carrier policies, CSP fees, Campaign outcomes, and TCPA or TSR exposure depend on your facts. Confirm current requirements with your provider and qualified counsel. MyTCRPlus does not guarantee approval, deliverability, or legal outcomes.
Related guide: CTIA guidelines for SMS explained