How to text all customers without sending a coupon?

[Widgeon819]

So here is my dilemma. I want to send a text message to all of our customers informing them of an important change to their service (we sell rural home internet). But every time I try to send a text square message I have to go through the setup process in marketing to setup a coupon. 

Only thing is I don't want to give them a coupon that way, as many wouldn't know how to use it (99% of our customers are setup as a recurring invoice and have autopay setup). I'd much rather go in each customers recurring invoice, and add a one-time discount. 

Is there a way for me to manually go into each customer profile and subscribe them to texts?

[MJD]

You may be better off using WhatsApp broadcast lists or something similar for text recipient lists or using a mailing list for emails which you can do with maichimp.com

if this helps mark it as best answer to help others in the future

note: WhatsApp broadcast lists require the recipient to use WhatsApp and have your contact saved