Sell from Blog lets you sell your ebook or software package via premium SMS payments.
This plugin lets you sell your ebook, software package or anything else small enough to fit into a standard email message (less than 10MiB is safe).
The buyer obtains a code through premium sms service and enters it along with his or her email addres in the form. If the code is correct, Sell from Blog creates a message, attaches your package to it and sends it to the buyer's email address.
The package you want to sell is placed on your own server, in a secured directory which is not accessible from outside.
There is also a dashboard widget which shows you how many codes you have left and gives detailed info on last 25 transactions.
Additionally, you can ask buyers to let you send additional information to their email address (can be turned on of off in the admin section).