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Twilio's Programmable SMS API helps you add robust messaging capabilities to your applications. Please read pricing details carefully.
Delivers patented phone-based verification and two-factor authentication using a time-based, one-time passcode sent over SMS
Quickly integrate Direct7 SMS Gateway and reach your customers over D7's own connectivity to global mobile network.
Simple SMS Sender is an API that allows you to send a message to a phone number very easily.
Send SMS & text-to-speech messages, perform phone number lookups and much more via sms77.io.
Generate and validate time-based one-time passwords (TOTP) for your second factor authentication (2FA) scenario using Google Authenticator app with no payments for sms gateways.
Reduce undeliverable messages, identify local-friendly number formats, and resolve caller names with Twilio Lookup. Find phone types, carriers, and more; Lookup allows you to programmatically get information about phone numbers so you can be as effective as possible.
Power your application with Two Factor Authentication with OTP API. Generate OTP code and validation API are available where you just have to worry about your application logic.
Sign up for a free account at https://clicksend.com ClickSend is not a free service. Pricing can be found here https://clicksend.com/?r=pricing/
Intelligent Technologies SMS API. Allows sending and receiving of SMS messages. An account is required. Sign up for free at http://inteltech.com.au Send messages to any country in the world.
MessageBird provides a simple and fast API for sending and receiving text messages (SMS) all over the world. Other related services are HLR-Lookup (network query) and sending and receiving Premium SMS messages.
QR code generator with text,url,tel,sms and email datatypes .
Protect your phone number from spam messages with SMSer. All Number country US +1
MoceanAPI makes sending SMS and 2FA verification easy. Try for FREE now. 20 trial SMS credits will be given upon [registration](https://dashboard.moceanapi.com/register?fr=rakutenapi).