I Tried Twilio, Telnyx, and OpenPhone. Only One Let Me Launch Fast

I needed a phone number that could send texts for a business project. I figured it was an afternoon of work. Sign up, buy a number, wire up the API, done. I have built enough integrations over the years to know the code is rarely the hard part, and I still underestimated this one. The numbers in this article are what I could verify in July 2026, and they change, so check before you commit.

If you want to send business SMS in the US, you cannot just buy a number and start texting. Every provider has to register you under A2P 10DLC, a carrier rule that covers all application to person traffic on regular 10 digit numbers. You register your brand, then you register a campaign describing what you will send, then you wait for carriers to approve it. On Twilio the brand registration costs about $4.50 and each campaign costs $15 a month, and the campaign review commonly takes 10 to 15 business days, sometimes up to four weeks. Four weeks of waiting, for a side project you wanted to launch this weekend.

Twilio is the default answer, and for good reasons. The docs are the best in the industry, every tutorial on the internet uses it, and almost any problem you hit has already been answered somewhere. US outbound SMS runs around $0.0083 per message and voice around $0.014 per minute, and you get about $15.50 in trial credit to play with. Technically I have nothing bad to say. But the trial credit only lets you text your own verified number. Real traffic still waits behind 10DLC approval, and Twilio cannot make carriers move faster.

Telnyx is the one that surprised me. US SMS around $0.004 per message and voice around $0.007 per minute, roughly half of Twilio, because they run their own carrier network instead of reselling someone else's. They also pass 10DLC registration fees through at cost instead of adding a markup. If SMS is going to be a real feature in your product and volume matters, Telnyx is the one I would study seriously. But the same carrier approval wait applies. Cheaper does not mean faster.

OpenPhone is a different animal, and that is exactly the point. It is not an API, it is a business phone app. You get a number, calling, texting, a shared inbox for a team, and their onboarding walks the carrier registration through for you as part of signup. For me it was the fastest path from nothing to sending real texts to real customers. I did not write a single line of code, which felt strange for about ten minutes, and then it felt like relief.

The honest answer is that they are not competing for the same job. If SMS is a feature inside your product, you need an API, and you should compare Twilio's ecosystem against Telnyx's pricing and accept the 10DLC wait as the cost of doing it right. If what you actually need is a working business phone this week, OpenPhone gets you there while the API crowd is still filling out campaign forms. I thought I needed an API. What I needed was to talk to customers.

Launching fast is mostly about removing steps you do not actually need. How much of your stack is there because the product needs it, and how much is there because developers like us default to building?