bjuriewicz

Free SMS for WooCommerce is a plugin that sends SMS notifications (when, for example, you change the order status to completed) directly from your phone, using dedicated open-source Android app.
features: 
* 30 messages/month for free 
* $2 monthly for unlimited messages, or you can spin up your own service and have it for free (see the plugins website for more details). 
* No contracts and additional fees 
* Send different messages to different countries 
* Or just send messages to your country only 
* Send messages when order is placed, completed, cancelled, delayed and more

Free SMS for WooCommerce

Free SMS for WooCommerce is a WooCommerce plugin that sends SMS notifications directly from your phone, using dedicated Android app.

notifybiz

Notify for WooCommerce adds the ability to send SMS notifications for every status of the order. Every status trigger 
can be enabled or disabled and customized. For the moment we have only Romanian (RO) customers. If you want this to your country, let us know at hello@notify.biz.

Notify for WooCommerce

Notify for WooCommerce adds the ability to send SMS notifications for every status of the order.

Free SMS for WooCommerce vs Notify for WooCommerce