--- title: "Bulk SMS in the USA: TCPA, 10DLC and Business Texting Guide" description: "Bulk SMS USA guide: TCPA consent, 8am to 9pm window, 10DLC vs toll-free vs short code, CTIA opt-out rules, carriers and SMS length with tested examples." canonical: "https://omnichannels.ai/blog/bulk-sms-usa-guide/" language: "en" updated: "2026-11-06" publisher: "BroadNet Technologies" brand: "OmniChannels.ai" category: "sms" primaryQuery: "bulk sms usa" keywords: ["bulk sms usa", "business texting usa", "tcpa text message rules", "10dlc vs toll free vs short code", "sms marketing consent usa", "a2p sms united states", "ctia messaging principles"] published: "2026-11-06" author: "OmniChannels.ai Editorial Team" reviewer: "BroadNet Messaging Solutions Team" readingMinutes: 10 answer: "To send bulk SMS in the USA, register your brand and campaign for 10DLC (or use a verified toll-free number or a short code), because US carriers do not accept alphanumeric sender IDs. Get prior express written consent before marketing texts under the TCPA, send marketing only between 8 a.m. and 9 p.m. in the recipient's local time, and honour STOP replies promptly." takeaways: ["The US has no alphanumeric sender IDs for business SMS: you send from a registered 10DLC number, a toll-free number or a short code, and our regulation data lists a typical 10DLC lead time of 7 to 14 business days.", "Marketing texts need prior express written consent under the FCC's TCPA rules (47 CFR 64.1200); transactional messages such as OTPs and delivery alerts sit under an established-business-relationship exception in our regulation data.", "Our regulation data records a marketing window of 08:00 to 21:00 in the recipient's local time, which matches the 8 a.m. to 9 p.m. limit in 47 CFR 64.1200(c)(1); the US spans several time zones, so schedule per recipient.", "FCC rules let people revoke consent by any reasonable means, and the FCC treats replies such as STOP, QUIT, END, CANCEL and UNSUBSCRIBE as reasonable; requests must be honoured within a reasonable time, not more than ten business days.", "Four networks appear in our coverage data: T-Mobile USA, AT&T and Verizon with direct routes, and UScellular on an operator route."] faq: - q: "Is bulk SMS legal in the USA?" a: "Yes, if you have the right consent, send through a registered route and honour opt-outs. Federal rules come from the TCPA and the FCC, while carriers add their own requirements through CTIA guidelines and 10DLC registration. State laws can be stricter, so have counsel review your program. This guide is general information, not legal advice." - q: "Can I use an alphanumeric sender ID in the USA?" a: "No. Our regulation data lists 10DLC, toll-free and short codes as the options and states there are no alphanumeric sender IDs for US destinations. Your brand name appears in the message text instead, which is why CTIA-style messages start with the business name." - q: "What is the difference between 10DLC, toll-free and short code?" a: "10DLC is a local 10-digit number registered with The Campaign Registry, toll-free is an 800-style number that is text-enabled and verified, and a short code is a 5 or 6 digit number leased and approved through carriers. They differ in set-up effort, throughput and look. Our comparison guide has the table." - q: "What are the quiet hours for marketing texts in the USA?" a: "47 CFR 64.1200(c)(1) restricts telephone solicitations before 8 a.m. and after 9 p.m. at the called party's location, and our regulation data applies that window to marketing A2P messages. Send by the recipient's local time, not yours, and use a scheduler that handles time zones." - q: "Do I need consent for transactional texts such as OTPs?" a: "Our regulation data records that transactional traffic is permitted under the established-business-relationship exception, but the content must really be transactional. A code, a delivery alert or an appointment reminder qualifies in practice; adding a promotion turns it into marketing, which needs written consent. Ask counsel about edge cases." - q: "How long does 10DLC registration take?" a: "Our published typical lead time is 7 to 14 business days. That is a range, not a promise: carriers and the registry decide, and missing or inconsistent business details cause delays and rejections. Plan the registration before your launch date and register OTP and marketing as separate campaigns." sources: - title: "47 CFR 64.1200, Delivery restrictions (TCPA rules), eCFR" url: "https://www.ecfr.gov/current/title-47/chapter-I/subchapter-B/part-64/subpart-L/section-64.1200" - title: "FCC 24-24, Strengthening the Ability of Consumers To Stop Robocalls (revocation of consent)" url: "https://docs.fcc.gov/public/attachments/FCC-24-24A1.pdf" - title: "CTIA Messaging Principles and Best Practices (May 2023)" url: "https://api.ctia.org/wp-content/uploads/2023/05/230523-CTIA-Messaging-Principles-and-Best-Practices-FINAL.pdf" - title: "The Campaign Registry" url: "https://www.campaignregistry.com/" - title: "Federal Communications Commission (FCC)" url: "https://www.fcc.gov/" - title: "3GPP TS 23.038: Alphabets and language-specific information" url: "https://www.3gpp.org/dynareport/23038.htm" --- # Bulk SMS in the USA: TCPA, 10DLC and Business Texting Guide Canonical: https://omnichannels.ai/blog/bulk-sms-usa-guide/ Language: en Publisher: OmniChannels.ai by BroadNet Technologies This guide is for marketing, e-commerce, healthcare, fintech and operations teams that want to text customers in the United States. It explains the legal layer (the TCPA and the FCC), the carrier layer (CTIA and 10DLC), which number type to choose, and how to write messages that fit one segment. It is a practical overview, not legal advice; the US also has state laws, so review your program with US counsel. ## What rules apply to bulk SMS in the USA? Three layers apply: federal law (the TCPA, enforced through FCC rules), industry rules that carriers enforce (CTIA guidelines and 10DLC registration), and state laws. The first is law; the second decides whether your messages are actually delivered. | Layer | What it covers | Where to check | |---|---|---| | FCC and the TCPA | Consent for marketing texts, time-of-day limit, revocation of consent | [47 CFR 64.1200](https://www.ecfr.gov/current/title-47/chapter-I/subchapter-B/part-64/subpart-L/section-64.1200), [fcc.gov](https://www.fcc.gov/) | | CTIA | Opt-in records, opt-out, HELP, prohibited content, short code monitoring | [CTIA Messaging Principles](https://api.ctia.org/wp-content/uploads/2023/05/230523-CTIA-Messaging-Principles-and-Best-Practices-FINAL.pdf) | | Carriers and The Campaign Registry | Brand and campaign registration for 10DLC, filtering, throughput | [campaignregistry.com](https://www.campaignregistry.com/) | Our regulation data lists the Federal Communications Commission and CTIA as the governing bodies and records TCPA-compliant express written consent for marketing, an established-business-relationship exception for transactional traffic, and STOP honoured immediately and confirmed once. ## Do you need consent to send bulk SMS in the USA? For marketing texts, yes: you need prior express written consent. Under 47 CFR 64.1200(a)(2), telemarketing messages sent with an autodialer or prerecorded voice need the called party's prior express written consent, and the FCC's rules define that as a signed written agreement (an electronic signature counts) that clearly authorises the seller and gives the number. Practical consequences: - **Capture the wording shown, the date and time, the channel and the number.** CTIA also expects senders to keep records such as the timestamp and the acquisition method. - **Say what people are signing up for.** The call to action should name the business, the type of messages and how often they come. - **Do not buy lists.** A purchased list has no consent trail. - **Do not treat a customer relationship as marketing consent.** A purchase may support transactional texts about that purchase, not promotions. The consent question changes by message type, which is why the split below matters. Our [opt-in consent generator](/tools/opt-in-consent-generator/) drafts sign-up wording, and the guide to [opt-in consent across channels](/blog/opt-in-consent-multichannel-campaigns/) shows how to store the record. ## What happens when someone says STOP? You must honour the opt-out promptly. In its 2024 order on revocation of consent, the FCC said that people can revoke consent by any reasonable means, that replying with words such as stop, quit, end, revoke, opt out, cancel or unsubscribe to a text is a reasonable way to do it, and that callers must honour the request within a reasonable time, no more than ten business days after receipt. The FCC has since opened further proposals on this rule, so check the current text of 47 CFR 64.1200 before you hard-code a deadline. CTIA adds industry expectations: let people opt out at any time through more than one route, understand ordinary phrases as well as the keyword STOP, send one final confirmation, and then send nothing more. HELP should return your business name and a way to reach customer care. Our regulation data matches: STOP honoured immediately and confirmed once. Keep one suppression list across all your numbers and campaigns. A person who texts STOP to your marketing number has not agreed to receive the same promotion from a second number. See [opt-out](/glossary/opt-out/) for the definition. ## When can you send marketing texts? Marketing texts should reach recipients only between 8 a.m. and 9 p.m. in the recipient's local time. The limit appears in 47 CFR 64.1200(c)(1), which bars telephone solicitations before 8 a.m. or after 9 p.m. at the called party's location, and our regulation data records the same window for marketing A2P SMS. Three practical points: 1. **Use the recipient's time zone.** The country spans several, so a 7 p.m. send from the East Coast may be 4 p.m. in California and a 9 a.m. send from California is noon in New York. Schedule per segment. 2. **Allow margin.** A message queued at 8:55 p.m. may be delivered after 9 p.m. Stop scheduling earlier than the limit. 3. **Keep OTPs and alerts separate.** Transactional traffic runs at any hour, but only if it stays transactional. The [send time planner](/tools/send-time-planner/) helps map a list to local windows, and [quiet hours](/glossary/quiet-hours/) has the definition. ## Which number type should you use: 10DLC, toll-free or short code? Choose by volume, speed and how much brand trust you need. All three are accepted by US carriers; none is an alphanumeric sender ID. | Number type | Registration | Best for | Watch out for | |---|---|---|---| | 10DLC (10-digit local number) | Brand and campaign registered with The Campaign Registry through a provider; our typical lead time is 7 to 14 business days | Two-way conversations, reminders, mid-volume marketing | Throughput depends on brand and campaign approval, not on how many numbers you buy | | Toll-free | Text-enabled number plus a provider verification step | Customer service lines and alerts where an 800-style number is already your brand | Verification content and timing differ by provider | | Short code | Application and carrier approval | High volume, time-critical codes, large consumer programs | Longest lead time and a monitoring programme from CTIA | Our full comparison is in [short code vs long code vs toll-free](/blog/short-code-vs-long-code-vs-toll-free/), and the steps for the most common route are in the [10DLC registration guide](/blog/10dlc-registration-guide/). The [10DLC registration kit](/tools/10dlc-registration-kit/) prepares campaign descriptions and sample messages. The glossary defines [short code](/glossary/short-code/) and [long code](/glossary/long-code/). ## Why are there no sender IDs in the USA? US carriers route business SMS through numbers, not text names, so there is no registry that lets you display "ACME" as the sender. Our regulation data says so directly: 10DLC, toll-free or short code, with no alphanumeric sender IDs. In practice, put your brand at the start of every message, as the examples below do. The [sender ID page for the USA](/sender-id/usa/) shows the current position, and the [sender ID checker](/tools/sender-id-checker/) compares countries. For the wider picture read our guide to [SMS sender ID types](/blog/sms-sender-id-types-explained/). ## Which carriers deliver SMS in the USA? Our coverage data lists four networks: | Network | MCC-MNC | Route in our data | |---|---|---| | T-Mobile USA | 310-260 | Direct | | AT&T | 310-410 | Direct | | Verizon | 311-480 | Direct | | UScellular (T-Mobile) | 311-220 | Operator | Read delivery reports by carrier, because filtering differs. If a campaign performs well on one network and badly on another, the cause is usually content or registration, and our guide to [improving SMS delivery rates](/blog/sms-not-delivered-improve-delivery-rate/) walks through the diagnosis. ## How should you separate OTP and marketing traffic? Put OTPs, receipts and alerts on their own campaign and number, and promotions on another. Mixing them puts your login codes at risk if marketing complaints trigger filtering. | Traffic | Example | Practice | |---|---|---| | Transactional | OTP, order update, appointment reminder | Own campaign and number; no promotion inside; any hour | | Marketing | Offer, new class, loyalty message | Written consent, opt-out line, 8 a.m. to 9 p.m. local time | | Mixed | "Your order shipped. Get a free item next time" | Avoid; the offer makes it marketing | OTP content and security are covered in the [OTP authentication messages guide](/blog/otp-authentication-messages-guide/). ## How do you keep US SMS to one segment? Plain English text fits the default GSM 7-bit alphabet, so one message holds 160 characters (153 per part when split). One emoji or one curly quotation mark switches the whole message to Unicode, which holds 70 characters (67 per part). Definitions: [GSM-7](/glossary/gsm-7/) and [concatenated SMS](/glossary/concatenated-sms/). These examples were counted against the limits (Harbor Fitness is a synthetic gym chain): | Message | Encoding | Characters | Parts | |---|---|---|---| | `Harbor Fitness: Your class on Sat 14 Nov at 9:00 is confirmed. Reply C to cancel or STOP to opt out. Msg&data rates may apply.` | GSM-7 | 126 | 1 | | `Your Harbor Fitness code is 482913. It expires in 10 minutes. Do not share it.` | GSM-7 | 78 | 1 | | `Harbor Fitness: Bring a friend free this weekend. Book at harborfit.example/b Reply STOP to opt out. Msg&data rates may apply.` | GSM-7 | 126 | 1 | | `Harbor Fitness: Bring a friend free this weekend! 💪 Book at harborfit.example/b Reply STOP to opt out. Msg&data rates may apply.` | Unicode | 129 | 2 | | `Harbor Fitness: You’re in! Reply HELP for help, STOP to cancel. Msg&data rates may apply.` | Unicode | 89 | 2 | The last two rows show the cost of small characters: an emoji, and the curly apostrophe in "You’re" typed by a phone keyboard. Check final copy in the [SMS character counter](/tools/sms-character-counter/). For other scripts see [SMS character limits and Unicode](/blog/sms-character-limits-unicode-arabic/). ## A worked example: a regional gym chain "Harbor Fitness" (synthetic) has 30 clubs and wants class confirmations, a login code for its app and a weekend promotion. - It registers one brand and two campaigns, one for account and class messages and one for marketing, and expects 7 to 14 business days before launch. - The sign-up form says who is texting, what the messages are and how to stop, and stores wording, timestamp and number. - Class confirmations and OTPs use plain text under 160 characters. - The promotion goes to consented members only, grouped by time zone and scheduled after 9 a.m. local, finishing well before 9 p.m. - STOP replies from any number feed one suppression list. ## What are the common mistakes? - **Texting without written consent** because the person is a customer. - **No registration** and sending a bulk campaign from an unregistered 10-digit number. - **Ignoring time zones**, so West Coast recipients get messages outside the window. - **Mixing OTP and promotion** in one campaign. - **Emoji and smart quotes** that double the segment count. - **Treating lead times as promises.** Approvals are the carriers' and the registry's decision. ## How OmniChannels.ai helps OmniChannels.ai is powered by BroadNet, which has direct routes to T-Mobile USA, AT&T and Verizon in our coverage data. Our team prepares and files 10DLC brand and campaign registration and toll-free verification with you, and handles short code applications; approval decisions stay with carriers and the registry. You get per-carrier delivery reports, two-way SMS and SMPP 3.4 for high volume. See indicative list prices on the [USA SMS pricing page](/sms-pricing/usa/), read about [registrations](/services/registrations/) or [book a demo](/demo/). Small team? Start with our [SMS marketing guide for small businesses](/blog/sms-marketing-small-business-guide/).