I love to use the text message feature that tells me when my flight plan is transmitted to Center. This lets me know that my plan is on file before I take off VFR or contact clearance delivery. When I get an email notification it includes the expected clearance. This is a great feature since a clearance is very often different than a flight plan routing.
The expected clearance is not delivered via text message. I know there are size limitations, but maybe a second text message option to send the expected clearance only could work.
It is really a rare thrill to know what the clearance will likely be before a controller rattles it off like a machine gun. I wish it came to my phone.