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.

hamzarauf

Automatically send sms notification on new order creation to the customer. 
Admin Settings Page 
Help Page

Woo SMS Gateway

Automatically send sms notification on new order creation to the customer. Admin Settings Page Help Page

Free SMS for WooCommerce vs Woo SMS Gateway