Did you know you can email to a specific entity at att.net and it will convert to a SMS text to that phone
The To: should include:
10digitphonenumber@txt.att.net.
So if the number was 970 555 5555 it would be 9705555555@txt.att.net
Enter the text (reasonable size remember) in the description.
I think if you put 'Text from Me' in the Subject it helps to explain when it is received.
Not certain what the from will look like when the text comes in so make the description as clear as you can of who, what, when where and still be concise.
Care Desk Team