Send SMS using Web Application
To send SMS, you should buy bulk sms provider’s gateway service. In our case, we bought SMSCountry’s bulk sms.
Once you buy gateway, they provide API (paid service) else other interface (HTTP, Email2SMS etc. free service) to send sms messages.
If you have high amount of sms flow, you can goto API service, else you can use HTTP or Email2SMS service. We are using Email2SMS service, which is very easy to setup.