The plugin supports multiple SMS gateways. You can use different gateways for different countries to optimize your spending.
The list of supported SMS gateways:
- Nexmo (Vonage)
More gateways will be added in the future.
If you want to use one gateway for everything, you can set your gateway to target all countries:
SMS, WhatsApp, and Pushbullet can be all enabled at the same time, and the plugin will send only one notification per user (you can set the priority on the settings page)