Posted July 28, 2026
Texting is one of the highest-converting channels a campaign has — but only if your messages actually reach a phone. Before you send a single text, you need to register your sending number with the carriers, and campaigns have two main paths to choose from: shortcode and 10DLC. Picking the wrong one can mean delayed launches, throttled messages, or texts that never arrive at all.
Here's how the two compare, and how to figure out which one fits your campaign.
What Is a Shortcode?
A shortcode is a 5-6 digit number (think " 12345") leased directly from the carriers through a shortcode aggregator. It's built for high-volume, one-to-many messaging — the kind of blast you'd send to a large list all at once.
Pros:
- Very high throughput — shortcodes can send tens of thousands of messages per minute
- Strong deliverability once approved, since carriers pre-vet the use case
- Recognizable format that people associate with legitimate bulk sending
Cons:
- Expensive — leasing a shortcode typically runs several thousand dollars a month, plus setup fees
- Slow to launch — carrier approval (via CTIA/aggregator vetting) can take 8-12 weeks
- Overkill for smaller lists or peer-to-peer style outreach
What Is 10DLC?
10DLC stands for "10-Digit Long Code" — essentially a standard-looking phone number that's registered for business (in this case, campaign) messaging through The Campaign Registry (TCR). It's become the default path for most political texting programs.
Pros:
- Much faster to stand up — registration can be approved in days rather than months
- Lower cost — no shortcode lease fees, just registration and per-message carrier fees
- Works well for both mass texting and more personal, conversational or peer-to-peer programs
- Flexible: campaigns can register multiple 10DLC numbers under one brand for different purposes (fundraising, GOTV, volunteer recruitment)
Cons:
- Lower throughput than a shortcode — carriers cap messages-per-second, so very large blasts take longer to send
- Requires ongoing attention to trust scores and campaign-use-case registration to avoid carrier filtering
The Real Difference: Volume vs. Speed to Launch
The decision usually comes down to two questions:
- How big is your list, and how fast do you need to reach it? If you're sending to hundreds of thousands of contacts on a tight timeline, shortcode's throughput matters.
- How soon do you need to be live, and what's your budget? If you're launching mid-cycle and need to be texting within days, 10DLC is almost always the practical answer.
For most campaigns — especially state and local races, or federal campaigns still ramping up — 10DLC hits the sweet spot: fast approval, reasonable cost, and enough throughput for most GOTV and fundraising pushes.
Don't Forget TCPA Compliance
Regardless of which path you choose, registration is only half the equation. Every campaign texting program needs to be built around TCPA (Telephone Consumer Protection Act) compliance:
- Clear, documented opt-in for every number on your list
- Easy opt-out language (STOP/HELP) honored immediately
- Accurate campaign-use-case registration that matches what you're actually sending
- Careful monitoring of complaint and filtering rates, since carriers can throttle or block traffic that looks non-compliant
Getting the registration type right gets your messages eligible to be delivered. Compliance is what keeps them actually landing in inboxes cycle after cycle.
Bottom Line
If your campaign needs to move fast, keep costs manageable, and run a flexible mix of mass and peer-to-peer texting, 10DLC is usually the right call. If you're running a massive, single-purpose blast program at national scale and have months of lead time, a shortcode may be worth the investment.
Not sure which fits your program?
Talk to the Nucleus team about setting up compliant SMS registration before your next send.
