Since you're looking for a SMS Marketing tool, I would recommend Messent app as a good choice.
This app allows you to do all things such as: composing your messages in the app, arranging the cotact lists, setting up the schedules for the messages based on the customers attribut, etc
Especially, Messent is providing 90 days free for Premium plan to give the best support for customers in this busy Holiday Season
For more information, you can check our guidline article: Messent: Your truly wizard for SMS marketing
Wish you all the best on BFCM and this Holiday Season!