SMS Chatbot
for Your Business
AI agent on SMS. Carrier-compliant, 1-click deploy. Connects to your existing systems so it answers and acts in real time.
The AI SMS Agent Your Business Needs
SMS has a 98% open rate. No other channel gets that kind of attention, which is also why US carriers police it. An AI SMS agent lets you reach customers where they actually read, but only if your messages deliver. Modassembly handles US carrier registration (A2P 10DLC) for you, so your number is compliant and your traffic doesn't get filtered as spam.
SMS is a different medium than WhatsApp: shorter messages, no rich templates, a different tone. Our SMS agents are tuned for that. Appointment reminders, two-factor codes, lead follow-ups and post-purchase support, all through a text thread your customer already trusts. Built on Claude, one of the most capable AI models available, not on scripts.
SMS also has an advantage WhatsApp does not: your customer does not need to install anything. Every phone has SMS built in, from the cheapest flip phone to the newest iPhone, across every country. That matters for industries where your audience is older, less tech-savvy or does not use WhatsApp at scale, which still describes most of the United States. A well-run SMS program reaches people who would never download an app or check an email.
What Your SMS Chatbot Can Do
Customer Service via Text
Answer customer questions via SMS 24/7. Deploy an AI customer service agent that handles FAQs, troubleshoots issues and escalates complex requests.
Appointment Booking
Let customers book, reschedule and manage appointments through text messages. Integrates with your calendar automatically.
Lead Capture & Follow-Up
Qualify leads, answer product questions and follow up with prospects via SMS. Automated text bot that never misses a lead.
Works with WhatsApp Too
The same AI agent that powers your SMS chatbot can also run on WhatsApp. One agent, multiple channels.
Connects to Your Existing Systems
An SMS agent that cannot read your data is just an autoresponder. Modassembly SMS chatbots integrate with the systems your business already runs through APIs, webhooks and database access. Your CRM, booking calendar, e-commerce platform, payment processor and custom internal services all become live context for the agent. “Where is my order?” gets a real-time answer from your shipping system. “Reschedule my Tuesday appointment” updates your calendar without anyone picking up the phone.
Common integrations include HubSpot, Salesforce, Pipedrive, Shopify, Stripe, Google Calendar, Twilio, your telephony stack and custom internal services. On the Starter plan the agent builds integrations as needed. On the Custom plan our team architects the integration layer end to end, including authentication, permissioning and auditability.
SMS Chatbot Use Cases
SMS works best for high-urgency, low-friction interactions. Here are the shapes we see most often for small and medium businesses deploying an SMS chatbot.
Appointment reminders and confirmations
Clinics, salons, dentists, tutors, contractors. Send the reminder 24 hours out, the confirmation ping the morning of and a reschedule option if the customer cannot make it. No-show rates drop sharply when reminders land in a channel people actually read.
Lead follow-up and nurture
Real estate, auto dealers, home services, B2B sales. A lead fills out a form at midnight; the agent texts them back in seconds with a qualification question or a booking link. Response rate on a 2-minute-old lead is an order of magnitude better than on a 24-hour-old one.
Order and delivery updates
E-commerce, logistics, local delivery. Order placed, packed, shipped, out for delivery, delivered. The agent also handles the inbound: “where is my order?” gets a real-time answer from your shipping system instead of a human having to look it up.
Reviews and re-engagement
Restaurants, retail, local services. A polite text after a positive interaction, with a direct link to your Google or Yelp profile. Dormant customer? A personalized re-engagement text with a relevant offer pulls them back far better than email.
Customer service overflow
When phone lines are slammed, customers can text your number instead of holding. The agent handles the simple questions live and queues the rest for your team, with full context attached so a human can pick up mid-thread without missing a beat.
Modassembly vs Traditional SMS Tools
SMS tools have existed for decades. Here is how a Modassembly AI agent compares to what the market has shipped until now.
Bulk SMS and autoresponders
Good at blasting the same message to a list. Useless at conversations. A Modassembly agent handles back-and-forth, understands what the customer actually asked and responds with real information, not a hard-coded fallback.
Twilio Studio and flow builders
Drag-and-drop trees powered by SMS infrastructure. Flexible but brittle, and every new branch is more maintenance. Modassembly agents replace that tree with an understanding model that adapts automatically, and we still build on top of Twilio-grade infrastructure underneath.
Roll-your-own on raw APIs
You can wire up Twilio + OpenAI/Anthropic + your database yourself. It works, and it takes real engineering time, plus carrier registration, plus ongoing maintenance, plus monitoring. Modassembly gives you the same flexibility as managed infrastructure, so you focus on the business logic instead of the plumbing.
“My day-to-day job is making systems integrations between call centers, Salesforce, Zoho and marketing campaigns. With AI Agents, we're a smaller team, getting more done and faster.”
Deploy Your SMS Chatbot Today
Get your AI SMS chatbot running in minutes with 1-click deployment. Start with a 14-day free trial and $20 in API credits. Plans from $30/month with credits, or $20/month BYOK.
For higher-volume deployments, short-code provisioning, multi-agent orchestration or deeper integration with your CRM, telephony or internal systems, our Custom plan puts our engineering team on your deployment directly. We will scope the carrier setup, the compliance posture and the integration layer together.
SMS Chatbot: Frequently Asked Questions
An SMS chatbot is an AI agent that communicates with your customers or team through text messages. Modassembly's SMS chatbot is powered by Claude, so it understands natural language, handles complex requests and builds its own integrations with your systems. Unlike old-school SMS autoresponders that just send canned messages, a Claude-powered SMS agent can actually hold a conversation and take action on your behalf.
Modassembly deploys your SMS chatbot with 1 click. Sign up for the Starter plan ($30/month with $20 in API credits, or $20/month BYOK), configure your agent through our AI onboarding process, provision a phone number and go live on SMS in minutes. We handle the carrier registration (A2P 10DLC in the US) on your behalf so your traffic is compliant from day one. No technical expertise needed.
Starter is $30/month with $20 in API credits at face value (no markup), or $20/month BYOK, and includes 1-click deployment to SMS or WhatsApp plus 1 AI Admin agent. Business starts at $75/month with $50 in API credits, or $50/month BYOK ($125/$225 with $100/$200 in credits also available), and adds 2 AI Staff agents (examples: customer service, dispatcher, back office, business developer, data analyst and more), multi-agent orchestration and deployment to website, Slack, email and Telegram. Custom is done-for-you (let's-talk pricing) for bespoke architecture and unlimited agents. Every plan includes a 14-day free trial with $20 in API credits. SMS per-message fees are separate and billed by the carrier.
Yes. The same custom AI agent can be deployed to SMS and WhatsApp with shared knowledge, shared tools and shared memory. With the Business plan you can also deploy to your website, Slack, email and Telegram. Customers who start on SMS and continue on another channel get the same experience, and you manage one agent instead of five.
An AI SMS agent can handle customer service 24/7, book and manage appointments, send reminders, qualify leads, answer FAQs, process orders, collect reviews, run re-engagement campaigns and more. It builds its own integrations with your existing tools and systems, from your CRM and calendar to your e-commerce platform or internal databases.
In the United States, yes. Any business sending application-to-person (A2P) SMS traffic needs to register with The Campaign Registry under the 10DLC framework, otherwise carriers will filter or block your messages. Modassembly handles the registration, brand and campaign setup for you, so your agent runs on a compliant, trusted number from the start.
Yes. Your agent can run on a local long code, a toll-free number or a short code, and can send and receive MMS where supported. For high-volume use cases, short codes deliver better throughput and better deliverability. We will help you pick the right option for your volume, geography and use case.
SMS has the highest open rate of any channel, typically above 95%, and a near-instant read time. Customers check texts almost immediately, which is why appointment reminders and two-factor codes live there. The trade-off is that SMS is more tightly regulated, more expensive per message and more limited in formatting. WhatsApp is richer but requires the customer to have it installed. Email is cheapest but easy to ignore. The best programs use all three, and Modassembly agents can run on all three with a shared brain.
The agent is configured with your voice and tone, so conversations feel natural. You can be transparent about the AI or keep it in the background, depending on your brand. In either case, the agent hands off to a human the moment the situation calls for one, so the customer never hits a dead end.
Messages are transmitted through the major SMS carriers and handled by your agent with scoped access to your systems. Modassembly does not sell, share or train on your conversation data. For use cases with strict requirements (healthcare, finance), we recommend keeping sensitive data out of SMS entirely and using the agent to direct customers to a secure channel, which is straightforward to configure.