Can you only send invoices by email or can you send by text message?

Hello Alex-supremeclea, 

Welcome to the Community page, 

It is not possible to send invoices from QB via text message, you can only send them via email. 

@alex-supremeclea 

You will need an SMS app and a connector to integrate with your QBO. You can set when you send invoice the connector will be triggered and order SMS app to send invoice link too.