10DLC vs Short Code vs Toll-Free: Which US SMS Number to Use
10DLC, toll-free and short codes are the three registered routes for US business SMS. Compare registration, timelines, fees, throughput and fit, and see which one suits your traffic.
SMS.to vs Twilio vs Telnyx: Pricing, Coverage and Features Compared
A sourced 2026 comparison of SMS.to, Twilio and Telnyx: published SMS prices, carrier and 10DLC fees, channels, international coverage, Verify pricing and support, and which one fits which team.
Build a Multichannel OTP Flow With Smart Fallback: SMS, WhatsApp, Viber, Email and TOTP
A practical guide to multichannel OTP design: choosing the first channel, setting fallback windows, where email and authenticator apps belong, and how fallback is billed.
What Is SMPP? Protocol, Ports and How It Works
SMPP (Short Message Peer-to-Peer) is the binary protocol carriers and high-volume senders use to exchange SMS with an SMSC. This guide covers versions, binds, PDUs, delivery receipts, encoding, ports and security.
SMPP API vs HTTP API: Which Is Better for SMS?
An HTTP API suits most apps; an SMPP API suits carriers, aggregators and heavy, spiky senders. Compare throughput, setup, delivery reports and security, with real code and clear signs it is time to switch.