Cell Phone programming

I was curious to know what programming languages they are programming cell phones in. Is there a way to edit the programs on cell phone through a regular interface or would you have to use an EPROM.

Thanks for your time

http://www.codeguru.com/forum/archive/index.php/t-196916.html
recommends these two:

http://forum.java.sun.com/wireless/
www.midlet.org

hope that helps in some way...