Jesse from the Guru Team here.
Thanks for sharing.
I just wanted to point out that we do actually support text message order notifications for shop owners.
Shopify has now default feature to send email and SMS notification directly to your customers to notify your customer about their order submission.
You can use this default feature as well.
And if you are looking for best and cheap SMS marketing solution for your store then this app SMS Daddy will help you lot.
For more information, you can visit this app SMS Daddy
Shopify App team