Registration, throughput and the rules governing business SMS
If your business sends SMS to US numbers from a normal 10-digit line, you are in 10DLC territory. Skipping registration does not mean lower throughput, it means blocked messages.
7 min read · Written by the Autocloz team
What 10DLC is
A 10-digit long code is an ordinary phone number. Historically businesses used them for person-to-person texting, and carriers tolerated light automated use. That ended: US carriers now require any application-to-person traffic on long codes to be registered under the 10DLC framework.
Registration links three things — your business identity, a declared campaign describing what you send, and the numbers sending it. Carriers use this to assign throughput and to attribute complaints.
The registration chain
- Brand registration. Your legal entity, verified against tax ID. This produces a trust score.
- Campaign registration. A description of the use case, with sample messages and opt-in details. Approved per use case, not per number.
- Number assignment. Numbers are attached to an approved campaign.
Each step has a fee, and each is reviewed. Vague campaign descriptions and sample messages that do not match actual traffic are the two most common rejection causes.
Throughput is a consequence, not a setting
Your messages-per-second limit is derived from your brand trust score and campaign type. A sole trader with a low score and a generic marketing campaign gets a fraction of the throughput of a verified enterprise.
This is why volume planning has to happen before launch. Buying more numbers does not multiply throughput the way it once did, because limits are applied at the campaign level.
Unregistered A2P traffic on a long code is not throttled — it is increasingly blocked outright, and carriers levy per-message fees on violations.
Content rules that trigger filtering
- SHAFT. Sex, hate, alcohol, firearms and tobacco content is prohibited or heavily restricted.
- Public URL shorteners. Shared shortener domains are commonly blocked. Use a branded one.
- Missing opt-out language. The first message in a conversation should carry STOP instructions.
- Mismatch with registration. Sending marketing on a campaign registered for notifications gets the campaign suspended.
How Autocloz fits
Autocloz connects to your own Twilio, Plivo or equivalent account rather than reselling numbers, so your brand and campaign registration stay in your name and move with you.
The compliance gate checks registration status, opt-out language and quiet hours before dispatch, and rate-limits sending to the throughput your campaign is actually approved for rather than queueing messages that would be rejected.
Common questions
Does 10DLC apply outside the US?
No. It is a US carrier framework. Other countries have their own regimes — sender ID registration in India, for example — with different requirements.
Can I use a toll-free number instead?
Toll-free numbers have a separate verification process and generally higher throughput for notification traffic, but they are not exempt from verification.
How long does registration take?
Brand registration is often same-day. Campaign vetting varies from hours to several weeks depending on use case and whether manual review is triggered.
What happens if my campaign is rejected?
You can resubmit with corrections. Repeated rejections on the same brand can affect your trust score, so it is worth getting the sample messages right the first time.
Bring your own carrier
Autocloz runs SMS on your Twilio or Plivo account, so your registration stays yours.