This technique might become totally unstable in the future, given the massive and chaotic networks of the corporate world and the knowledge level of the people that work in those environments, however here is some useful info on how to do this:
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I assume you can do this through all email clients. To send a text message to a USA phone number, simply type the area code followed by the 7 digit number with no spaces, hyphens or () parenthesis, then add "@" plus the phone carrier's domain, which can be found here:
https://en.wikipedia.org/wiki/SMS_gateway#Email_clients
I have tested this with most of the carriers in the above list. Some carriers display the sender's phone number and others display the sender's email address. When I tested this I was sending the messages from a gmail account and my phone number and email address were in my google contacts, so that may be the reason why my phone number showed up in some of the messages instead of my email address. I would assume if you don't have your phone number stored in your email client, it would not show up in the message sent to the receiver.
The attached image is what I saw when I sent a test text message to my US Cellular Andoid phone.....
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