Here are my favorite ways to use cell phones for learning.
1) Poll Everywhere or Text The Mob
I use Poll Everywhere to capture the thoughts and ideas of every student.
Flickr is a great way to quickly and easily create slideshows. This is fun to do with a new class. In an instant you can created a class slideshow by asking everyone to take their picture and place their name in the subject and something they want the class to know about them in the body, then email it to Flickr. Here's what that looks like http://www.flickr.com/photos/theinnovativeeducator/tags/cells4ed/show
I use iPadio to make a quick and simple phonecast right from my phone. Here are some other ideas for phonecasting http://theinnovativeeducator.blogspot.com/2010/12/ten-ideas-for-educating-innovatively.html
I love Tweeting right from my phone and the updates feed directly into my website or blog. Some principals do this to celebrate student success and update the school on topics of importance. It instantly shows up on their website. Here's an example http://www.kurthahnschool.org.
5) Note Taking
I use my phone every day to take notes. The great thing about taking notes on a phone is that it's easy to search and share.
6) Cha Cha
If I don’t know something, I just text the question to Cha Cha at 242 242
If you have some ideas, you can help out these students by sharing your ideas at http://tinyurl.com/kidcellsurvey.