Why did I choose https://testelium.com/api/ REST API for SMS delivery tests from Testelium? I was amazed by the professional support for implementing and executing the API. This support is almost 24 to 7. Therefore, any issue is resolved almost instantly! Testelium is very easy to connect to your platform via an SMPP protocol. Therefore, use this API if you use SMS marketing or send bulk messages for authorization. Learn about packages by following the link.