To send and receive SMS in El Salvador, you can use an Android phone with the Telerivet Gateway app.
With the Telerivet Gateway app, your organization only needs one inexpensive Android smartphone with internet access and a local SIM card to serve as your SMS gateway.
The Telerivet Gateway app makes it possible to send and receive text messages (SMS) with any mobile phone user in your country – even if they don't have smartphones or internet access.
In addition, the Telerivet Gateway app can send and receive multimedia messages (MMS) containing images, audio, video, or document files.
How it works
The Telerivet Gateway app forwards SMS messages between your Android phone's mobile network and Telerivet's servers.
In order for the app to work, you just need to keep the Android phone turned on, connected to the internet, and make sure it has airtime to send SMS messages.