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Learn how to connect new or existing phone numbers to MessageDesk

Getting a business number texting in MessageDesk takes two stages, in this order: carrier registration first, then phone configuration. For most customers, registration isn’t optional and it isn’t something you can do afterward. MessageDesk blocks a US number from being added until your registration is approved. Register first. Adding the number afterward is the fast part.

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Your onboarding journey

1. Complete Carrier Registration This is the path for a US business texting from a local 10-digit (10DLC) number, which is most MessageDesk customers. If you’re a Twilio or Canada-only customer, see the exceptions below.
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Complete carrier registration

Go to Settings → Compliance Center → Registration and submit your brand and campaign. The form takes about 10 minutes, and MessageDesk can autofill much of it from your W-9.You may also need website changes first: a privacy policy, SMS terms and conditions, and a visible opt-in method. See Submit your carrier registration.
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Wait for approval

MessageDesk reviews your submission within about 24 hours, then upstream carriers review it for roughly another 48 hours.Track status in the Compliance Center. Corrections reset the clock, so submit carefully the first time.
3

Add your phone number

Once your campaign is approved, add a number from Settings → Phone Management:
  • Add new: search by area code and add a local 10DLC number, included in your subscription
  • Host existing: add texting to a landline, VoIP, or local number while your voice service stays put
  • Port existing: move voice and texting to MessageDesk
4

Start texting

Your number appears in Phone Management as active and campaign-associated. Message from your shared Inbox.
Don’t wait until you need a number to start registering. Approval takes a few business days, and MessageDesk won’t let you purchase, host, or port a US number without an approved campaign. If you have a launch date, work backward from it and register well before you need the number.
Toll-free numbers take a different review. Toll-free uses its own verification process rather than A2P 10DLC registration. The order is the same, verification before texting, but the submission differs. See Connect toll-free numbers.

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Exceptions to registration-first

Two groups don’t follow the path above. If neither describes you, skip this section.

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If you bring your own Twilio numbers

You handle registration inside Twilio, not MessageDesk. Connect your numbers and go. MessageDesk sets up a Twilio Event Streams subscription automatically so messages sync. The two-per-day add limit doesn’t apply to Twilio numbers either, since you connect them through your own account.

Connect Twilio Numbers to MessageDesk

Connect numbers you already own in Twilio.

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If your numbers are Canadian

Canada doesn’t use the A2P 10DLC system, so you can add a Canadian number without an approved campaign.
A Canadian number added this way can only text Canadian recipients. To text US numbers from it, complete carrier registration and associate the number with an approved campaign.

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Good to know

  • No per-number cost. Adding phone lines is included in your subscription. MessageDesk bills by user seat, not by phone line. See Pricing.
  • You do it yourself. Purchasing, hosting, and porting all run in-app from Settings → Phone Management. No support request, no external form.
  • One registration covers your lines. You don’t register each number separately. Your approved campaign applies to every local number you connect. Toll-free and Twilio lines are the exceptions.
MessageDesk caps daily number-adds at two per workspace. To protect against number-rotation scams, MessageDesk limits how many numbers you can add through purchase, hosting, or porting to two per day per workspace. If you hit the cap, the UI blocks additional adds until the next day. Need to add more in one day? Contact support. This cap doesn’t apply to Twilio (BYOC) numbers.

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Supported number types

MessageDesk can text-enable most business numbers in the U.S. and Canada.
  1. Landlines / local 10-digit numbers
  2. VoIP provider numbers (RingCentral, Dialpad, Zoom, Vonage, Nextiva, etc.)
  3. Toll-free numbers (800, 833, 844, 855, 866, 877, 888)
  4. Twilio numbers (connected to your Twilio account)
MessageDesk supports numbers in North America (US and Canada).

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Landlines / local 10-digit numbers

Text-enable traditional wired/legacy lines across all U.S. states and Canadian provinces.

Host a Landline or Local Number

Add texting to an existing landline or local number while your voice service stays put.

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VoIP provider numbers

Integrate numbers from common business VoIP systems (e.g., RingCentral, Dialpad, Grasshopper, Ooma, Aircall, Vonage, Nextiva, Verizon Business, AT&T Business, Zoom).
Verizon One Talk isn’t supported. One Talk lines are tied to Verizon’s mobile network, so you can’t text-enable them with MessageDesk. See Supported VoIP providers for alternatives.

Host a VoIP Number

Text-enable a number from your business phone system. Calling stays with your VoIP provider.

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Toll-free numbers

Text-enable North American toll-free numbers with prefixes 800/833/844/855/866/877/888.

Connect Toll-Free Numbers

Text-enable a toll-free number. Toll-free uses a separate verification process.

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Twilio numbers

Use your Twilio numbers within MessageDesk’s shared team Inbox. Registration stays in Twilio. See If you bring your own Twilio numbers.

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Unsupported number types

  • International numbers outside the U.S./Canada
  • Google Voice and mobile carrier personal numbers (unless fully ported out first)
  • Virtual numbers (non-carrier virtual SMS apps/services)
  • Short codes (outbound): MessageDesk doesn’t send from 5–6 digit codes
    • Inbound from short codes is supported (you can receive replies)
Note: To use a personal mobile or Google Voice number, you have to port it out of that carrier first. You can port it directly to MessageDesk and forward calls to a number you choose, or port it to a VoIP provider and let us host it for texting only.
Learn more: Move a Google Voice Number to MessageDesk

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Hosting vs. porting (what’s the difference?)

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Phone number hosting (text-enable only)

We add SMS to your existing number. Voice stays with your current provider.
  • Keep your current number
  • Calls continue to route exactly as they do now
  • Texts flow through MessageDesk into your shared Inbox
Once we host your number for texting, texts your VoIP system currently receives won’t appear there anymore. All texts arrive only in MessageDesk. Voice calls remain unaffected and continue to work in your current system.
Hosting works for traditional landlines, local 10-digit numbers, and most VoIP-connected numbers.

Host a Phone Number with MessageDesk

Step-by-step hosting instructions, including the in-app Letter of Authorization.

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Phone number porting (move everything)

We move the entire number (voice + text) to MessageDesk.
  • Full transfer of services
  • MessageDesk becomes the carrier of record for that number
MessageDesk doesn’t offer full voice service. After a port, texting runs through your Inbox. Set up call forwarding so inbound calls route to a number that can receive them. If you need full voice functionality on the number, port it to a VoIP provider instead and let us host it for texting.

Port a Phone Number to MessageDesk

What porting changes, what to prepare, and how to submit the request.
In short: Hosting = add texting to your current setup. Porting = move voice + text to MessageDesk.
Both hosting and porting run entirely in MessageDesk. You enter the number, MessageDesk verifies it can be transferred, generates a Letter of Authorization as a PDF from the details you provide, and you sign it in the same flow. Track the request from the Status column in Phone Management.

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Texting with multiple numbers

You can connect up to 48 phone lines to a single workspace and manage all Conversations in one place. Filter your Inbox by phone line, and tailor roles & permissions so only the right teammates see the right Conversations. Inbox Sidebar Phones Pn CleanShot 2025-08-26 at 09.12.11.png

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Deliverability after you’re approved

Registration gets you permission to text. These keep your messages landing:
  • Write like a business, not a spammer. Avoid generic short links and all-caps urgency. Carriers filter on content.
  • Include opt-out language where appropriate, and honor every opt-out.
  • Match your traffic to your campaign. Carriers compare what you send against the use case you registered.
Learn more: Carrier Registration Overview

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Frequently asked phone number questions

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How many phone numbers can I connect?

Up to 48 phone numbers per workspace.

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How soon can I start texting?

For most US customers, carrier registration is the long pole. Approval takes a few business days, and you can’t add a US number until it’s done. Once your number is connected and active, you can text immediately. Inbound texts arrive as soon as the number is connected, even while outbound is still gated.

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Does every teammate see every conversation?

No. Use roles & permissions to limit access by phone line, label, or teammate Inbox.

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Can I rename lines for clarity?

Yes. Go to Settings → Phone Management to name a line (you can even add an emoji), which helps triage in the Inbox.

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Can international users access MessageDesk with US or Canadian numbers?

Yes. You can use MessageDesk with US or Canadian numbers from outside North America. You’ll need to be tied to a North American business entity and complete carrier registration for that entity. For example, a US-based business with support representatives in other countries can use MessageDesk.

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Can I send or receive texts internationally with a US or Canadian number?

No. MessageDesk only supports sending and receiving text messages to and from phone numbers in North America (US and Canada). Even if you have a US-registered number, you can’t text phone numbers outside of North America.

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What if my provider isn’t listed?

If it’s a standard landline or VoIP number in the U.S./Canada, we can likely text-enable it. Use the configuration form, and we’ll route you down the right path.

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Can I use phone line extension numbers with MessageDesk?

MessageDesk doesn’t integrate with or support texting for phone line extension numbers. You can still configure user Roles and Permissions to limit access to certain phone lines. You can also use conversation assignment and Relays to automate who’s assigned to each Conversation on any given phone line. Learn more: Team Management | Relays