References

Refer to these books and links for additional knowledge.

 

URL's

http://www.yuiblog.com/blog/2007/10/02/challenges-of-interface-design-for-mobile-devices/

http://en.wikipedia.org/wiki/Telephone_keypad

http://arxiv.org/ftp/arxiv/papers/1007/1007.3633.pdf

http://www.mobiface.com/