Re: Why...
Email would have been worse.
There are 2000 voting sites, all using their own random devices.
How many have email setup? Do they have exchange server cos this is a work phone, gmail or still go to yahoo for webmail. Do you require every volunteer to reconfigure their phone to use a supplied email address and email server?
You get 2000 random typed emails in different formats, because there is no way you can have an auto fill template that works on all mobile email
How do you validate the emails?
How do you check that you haven't lost or miss-transcribed one?
Probably a simple web page would have been easier, but it should have been possible to write a simple app to send a few numbers to a server