How to Choose an SMS Provider for Business

Delivery Rates: The Factor That Matters Most

Delivery rate is the percentage of messages that actually reach the recipient's phone. This is different from the "sent" or "accepted" rate that some providers report, which only measures whether their system queued the message. A provider can show 99% sent rate while actual delivery to handsets is 85% because carrier filtering rejects the rest.

Delivery rates vary by carrier. A provider might deliver 95% of messages to Verizon subscribers but only 80% to T-Mobile, because T-Mobile's spam filtering is more aggressive and the provider's reputation with that carrier is lower. This is why aggregate delivery statistics can be misleading.

When evaluating a provider, ask for carrier-specific delivery data, not just an overall number. If the provider cannot break down delivery rates by carrier, that is a warning sign. They either do not track it or do not want to share the results.

Pricing Structures and Hidden Costs

SMS pricing looks simple on the surface but has several layers that affect your actual cost per message:

• Base message rate: The quoted per-message price, typically between $0.005 and $0.02 for domestic SMS. This varies by volume tier.
• Carrier surcharges: AT&T, T-Mobile, and Verizon each charge per-message fees that range from $0.002 to $0.005. Some providers include these in the quoted rate, others add them on top.
• Segment charges: SMS messages longer than 160 characters (or 70 characters with non-standard characters) are split into multiple segments. Each segment is billed separately. A 200-character message costs twice as much as a 150-character one.
• MMS pricing: Messages with images or media cost significantly more, typically $0.01 to $0.03 per message on top of carrier fees.
• Number rental: Monthly fees for your sending number(s), ranging from $1 for local numbers to $500+ for short codes.
• Registration fees: One-time 10DLC brand and campaign registration fees, typically $4 to $15 total.

Always ask for the total cost per delivered message, including all surcharges and fees. A provider quoting $0.007 per message but adding $0.004 in carrier fees is actually $0.011, which may be more expensive than a provider quoting $0.01 all-inclusive. For a detailed cost breakdown, see our guide on SMS marketing cost per message.

Carrier Relationships and Routing

SMS providers connect to phone carriers through either direct connections or aggregator intermediaries. Direct connections generally produce better delivery rates because the message passes through fewer systems, each of which can filter or delay it. However, maintaining direct connections with all carriers is expensive, so most providers use a mix of direct and aggregated routes.

The quality of a provider's carrier relationships affects three things:

• Delivery speed: Messages on direct routes typically arrive within 1 to 3 seconds. Aggregated routes can take 5 to 30 seconds, or occasionally minutes during peak traffic.
• Filtering rates: Carriers are more lenient with providers they trust. A well-known provider with a clean sending history gets fewer messages flagged as spam.
• Throughput limits: Providers with better carrier relationships often receive higher throughput allocations, meaning they can send more messages per second before hitting rate limits.

Ask your potential provider whether they have direct carrier connections or work through aggregators. The answer tells you a lot about the quality of service you can expect. Learn more about how carrier routing works in our carrier routing guide.

API Quality and Integration

If you plan to send automated messages (order confirmations, appointment reminders, triggered campaigns), the provider's API matters as much as their delivery infrastructure. A poorly designed API creates ongoing development headaches and limits what you can build.

What to evaluate in an SMS API:

• Documentation quality: Can you understand how to send a message within 10 minutes of reading the docs? If not, the API will be painful to work with long-term.
• Webhook support: Does the provider send you delivery status updates, incoming message notifications, and opt-out events via webhooks? Without webhooks, you have to poll their API constantly to get status updates.
• Error handling: Good APIs return clear error codes that tell you exactly what went wrong (invalid number, carrier rejection, rate limit hit). Bad APIs return generic errors that force you to guess.
• Rate limits: Understand how many API calls per second you can make before being throttled. This matters during high-volume sends.
• SDKs and libraries: Does the provider offer client libraries in your programming language, or do you need to write raw HTTP requests?

Compliance and Registration Support

10DLC registration is mandatory for business SMS on local numbers, and the process involves submitting information to The Campaign Registry through your provider. Some providers make this easy with guided registration flows, while others provide minimal support and leave you to figure it out.

Good compliance support includes:

• Guided registration: A step-by-step process within the provider's dashboard that walks you through brand and campaign registration.
• Sample message review: Feedback on your sample messages before submission, to catch issues that might cause rejection.
• Automatic opt-out handling: When a recipient texts STOP, the provider should automatically suppress that number from future sends and send the required confirmation response.
• Consent record storage: Some providers store opt-in records for you, which is valuable if you ever need to prove consent during a complaint investigation.

A provider that treats compliance as your problem alone is a provider that will leave you exposed when something goes wrong. Read our getting started guide for more on the registration process.

The Multi-Provider Approach

No single SMS provider has the best delivery rate to every carrier. Provider A might excel at delivering to Verizon while Provider B has better T-Mobile rates. This is why sophisticated senders use multiple providers and route messages based on the recipient's carrier.

Our platform takes this approach by integrating with 12 SMS providers simultaneously. When you send a message, the system identifies the recipient's carrier and routes through the provider with the highest delivery rate for that specific carrier. This carrier-based routing typically improves overall delivery rates by 5 to 15 percentage points compared to using a single provider.

The multi-provider approach also provides redundancy. If one provider experiences an outage or delivery issues, messages automatically route through alternatives. This eliminates the single point of failure that comes with relying on one provider. For more on how this works, see our SMS deliverability guide.

Questions to Ask Before Signing Up

Before committing to any SMS provider, get clear answers to these questions:

1. What is your delivery rate by carrier (AT&T, T-Mobile, Verizon) for 10DLC traffic?
2. Does the quoted price include carrier surcharges, or are those billed separately?
3. What is the total cost for a 160-character SMS delivered to each major carrier?
4. Do you have direct carrier connections or route through aggregators?
5. What is your average message delivery time (not just "sent" time)?
6. How does 10DLC registration work in your platform?
7. What happens when a recipient texts STOP? Is opt-out handled automatically?
8. What are the API rate limits for sending and for status queries?
9. What is the contract minimum? Can I start with pay-as-you-go?
10. What delivery reporting and analytics do you provide?

Any provider that cannot answer these questions clearly is not ready to support your business messaging needs.