Iam using M2.3.5 version for my website. I have already purchased Msg91 Transactional SMS and sending SMS using Sparsh plugin where i can edit templates for Order, Invoice, Shipment etc.
But now, I need to send Promotional SMS to notify my customers regarding seasonal offers. I can use same Msg91 SMS gateway but I want an extension where i can edit my promotional SMS templates in the admin panel.
Please let us know if any extension available for this. Thanks!!
Hope this article is useful for you: Top 15+ Magento 2 SMS Extensions For You
In my opinion, you should try the demo first to make sure it meets your requirements and contact the provider to clarify all your questions.
I am using this Magento 2 SMS Notification Extension by Landofcoder and I am satisfied with it, a lot of utilities, plugins everything is perfect and works well on my site.
This module allows the store admin to send notification text messages to customers to notify them about the activities on Magento stores. The customers can receive instant notification about their order, invoice, delivery process, credit memo, and also other different activities.
You can refer it to Magento 2 SMS Notification
Hope this is helpful!