All categories

Every guide in the library, grouped by what it helps you do.

articles: 1,498

Code examples
Step-by-step Node.js tutorials for sending SMS, MMS and WhatsApp with Twilio, Vonage, Sinch, Plivo, Infobip, MessageBird and AWS SNS.
472 articles
Area codes
North American area codes: where each one is, the cities it covers, and how to dial it.
295 articles
SMS compliance
Country-by-country rules for sending SMS: sender IDs, consent and opt-out, content restrictions, and US 10DLC registration.
245 articles
Phone number standards
How phone numbers are written in each country: formats, area codes, E.164 and validation.
225 articles
SMS pricing
What an SMS costs in each country, which providers carry it, and how to keep the bill down.
223 articles
Messaging channels
Building on WhatsApp, RCS, MMS and two-way messaging, from first message to delivery receipts.
25 articles
Tools
Reference guides for number formatting and numbering rules, plus a few integration walkthroughs.
12 articles
Legal
Sent's commercial license order form. The Terms of Service and every other policy are on the Legal page.
1 article

One API. Every channel.