Company in a BoxA field guide to business software

Explainer · Customer messages

Can AI answer texts sent to your existing business number?

Sometimes. It depends on what kind of number your customers text, and on which app they use to send the message. Here is how to tell what’s possible, and what to ask before you choose a service.

Company in a Box editors Updated October 2026 5 min read

Published by DavidAgents, maker of AgentsFast. Editorial policy

This guide summarizes provider and platform documentation we read on 5 October 2026; we didn’t test any service. It covers US and Canadian numbers, and services that connect a business number to a messaging provider. Apps that run on your own phone or computer are a separate route we didn’t review. AgentsFast is made by DavidAgents, which publishes this site.

First: which number do customers text?

An AI service can only answer texts that reach it. So start with the number on your sign, your van and your website, and who carries it today:

  • A personal mobile number on your own phone plan.
  • A landline, office or internet phone number from a phone company or a business phone service.
  • A toll-free number such as an 800 or 888 number.
  • A new number that a texting or AI service gives you.

If you aren’t sure which kind you have, your phone bill or provider can tell you.

A personal mobile number

Texts to a mobile number arrive through your mobile carrier, on your phone. Twilio and Telnyx both offer a way to add texting to a number while calls stay with your current provider, and both say it doesn’t work for mobile numbers.

The other route is moving the number itself, called porting. That moves calls and texts together: Twilio’s porting documentation says Twilio becomes the number’s carrier. Whether a particular number can move is checked number by number.

One option is a separate business number for customers, so your personal number stays personal. If customers already text your mobile, ask any service exactly what would happen to that number before you agree to anything.

A landline, office or internet phone number

Twilio and Telnyx both describe a middle path for these numbers: texting moves to them, while calls stay with your current provider. Here is what each one’s documentation says:

  • Telnyx supports US numbers and checks each one first. It asks for a signed authorization and a recent bill from your provider, and says activation typically takes one to three business days.
  • Twilio supports US and Canadian numbers. It won’t host a number that is already set up for texting with another provider. It confirms you control the number with a phone call and a signed authorization that must match your current provider’s records. It quotes up to one business day for a landline and up to three for a toll-free number. Its documentation also says the API for this is still in development and not meant for new customers yet.

If your number already sends or receives texts through another service, ask how a move would be planned so customers’ texts aren’t interrupted.

Texting from software also involves registration. Twilio’s documentation says texting US customers from software over an ordinary local number requires A2P 10DLC registration, and that its toll-free numbers need toll-free verification before they can text customers in the US and Canada. Ask who files this, how long it takes and what it costs.

Texts, iMessage, WhatsApp and Instagram are separate

Customers may say “I texted you” whichever app they used. These reach a business in different ways:

  • Text messages. Apple describes SMS and MMS, and RCS, as services provided by mobile carriers. Whether a particular business number supports RCS features is something to confirm with the provider.
  • iMessage. Apple describes it as messaging between Apple devices. Apple’s separate business channel, Apple Messages for Business, runs through an Apple-approved messaging provider after an Apple review.
  • WhatsApp and Instagram. Each has its own business connection through Meta, with its own rules about which numbers or accounts can be used and when a business may reply.

Connecting your texts doesn’t connect WhatsApp, Instagram or Apple’s business channel. Ask which channels a service supports, and whether each is a separate setup or a separate price.

The US wireless industry’s messaging principles are voluntary best practices, not law. They expect businesses to get a customer’s consent before texting them, and to honor an opt-out with one final confirmation and no further messages. Laws such as the Telephone Consumer Protection Act also apply to business texting. This guide isn’t legal advice: ask any service how it records consent and handles “STOP”, and check your own obligations.

Where AgentsFast fits

AgentsFast doesn’t sell texting on its own. Every number comes with a voice plan, and texting is added to that line. A text to the number goes to your AI agent, which replies from the same number.

At its published rates, a standard texting setup starts at $238 a month before other selected add-ons. That includes the $150 team, a $49 voice plan with one US number, a $19 text bundle and $20 carrier registration for your business. While your registration is reviewed, and until your website carries the texting consent form it needs, texting starts on a shared registration with a temporary daily limit.

The number your customers text has to be set up on AgentsFast: a new number from AgentsFast, or an existing number moved in. Number porting on request; ask whether your number qualifies and how the move would be arranged. Its pricing page mentions forwarding calls from an existing line; that is described for calls, so ask how texts to your existing number would be handled before you plan around it.

Questions to ask before you choose

  1. Will customers text my existing number, or a new number you give me?
  2. What kind of number is mine (mobile, landline, internet phone or toll-free), and do you support that kind?
  3. Do my calls stay where they are, or does the whole number move to you? What happens to calls and texts during the switch?
  4. Is my number already set up for texting somewhere else? How would you move it without interrupting texts?
  5. What registration does the number need, who files it, how long does it take and what does it cost?
  6. Which channels does the AI answer: texts only, or also WhatsApp, Instagram and website chat? Is each a separate setup or price?
  7. How do you record consent and handle “STOP” requests, and which part is my responsibility?
  8. When does the AI hand a conversation to me, and can I read and take over every thread?
  9. What does texting cost in total: the number, message bundles and registration fees?
  10. If I leave, can I take the number with me, and how?

What this guide can’t tell you

It summarizes documentation from a few providers and platforms, not how any service performs. We didn’t send test messages, move a number or sign up for anything. Other providers may have different rules, and these change; check before you decide. It covers the US and Canada, and provider-connected business messaging only.

Sources

All pages read on 5 October 2026. Provider pages describe what the provider offers; they are not test results.

  1. Twilio: Hosted Numbers FAQ. Texting on a number whose calls stay elsewhere: supported numbers, ownership checks, timing, current availability.
  2. Twilio: Port in phone numbers. Porting moves messaging and voice.
  3. Twilio: A2P 10DLC. Registration for texting US customers from software on local numbers.
  4. Twilio: Toll-free verification. Verification before toll-free texting in the US and Canada.
  5. Telnyx: Hosted SMS. Hosting versus porting, supported numbers, documents and timing.
  6. Apple Support: iMessage, RCS and SMS/MMS. The message types and which are carrier services.
  7. Apple: Messages for Business documentation. Approved providers and Apple’s review.
  8. Meta: WhatsApp business phone numbers. Which numbers can be used with WhatsApp’s business platform.
  9. Meta: Instagram messaging. Business accounts and when a business may reply.
  10. AgentsFast pricing. Voice plans, the included number, text bundles, carrier registration, call forwarding. Published by the same company as this site.
  11. CTIA: Messaging Principles and Best Practices (May 2023). Voluntary industry guidance on consent and opt-outs.

Change log: October 2026, first version.