The SMS service or SMS API is the application protocol interface, which is just a considerate method of saying the words used to interact between applications. This makes sure that all your SMSs are effectively sent in spite of the carrier included in the ultimate delivery. The precise answer is that the SMS API is an essential link in the delivery method of your messages.
Here are some things you need to look for while looking for an SMS API service provider:
Is the protocol you will be employing protected? HTTP + SSL encryption signifies the data sent over HTTP protocols cannot be accessed by others.
How much effective is your SMS API gateway provider’s network worth? Whether you are looking for Java SMS API, PHP SMS API or any other API, service providers are now providing free trials to prospective users, so you can check and authenticate their network quality.
Is the SMS API gateway provider’s documentation simple to use and recognize? A well-documented API and sample code should be accessible to developers.
Next, request what payment alternatives the SMS API gateway provider provides to new customers.
At last, you will want to verify even if the SMS API provider offers free SMS for testing purposes or not?
Apart from it, it is also necessary to look for gateway plugins for example: WooCommerce SMS notification plugin, OpenCart SMS plugin, etc. to make your SMS campaign successful. But, it all depends on your business requirement.