Universal Vision Technologies

Sends WooCommerce order and account related SMS notifications to customers and admin using UelloSend SMS Gateway, supports Ghanaian numbers only.
<h3>Notes</h3>
You will need to 
1. Register at https://uellosend.com and generate API Keys at https://uellosend.com/user-api.php . 
2. Register your SenderID at https://uellosend.com/register-brand.php and get it approved. 
3. Top up your account with credit before you can send messages

UelloSend SMS for WooCommerce

Sends WooCommerce SMS notifications using UelloSend SMS Gateway.

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.

UelloSend SMS for WooCommerce vs Free SMS for WooCommerce