I recently seen a few of my co-workers using their Phone carrier's website to text online from their number and though that would be a great feature for T-mobile to invest in for those of us who who and don't have access to our Phones.
You can do this through the DIGITS client.
Use DIGITS on your computer
magentatechie You are the BEST. Thank you.
Retrieving data ...
Manage your T-Mobile account
Use the T-Mobile App or your My T-Mobile account
We're here to help