After reading both speeches, the evidence presented by Deborah Pendergast makes it clear that Tweens are ready for cell phones.
First, a key factor as stated in the article is people want their kids to feel safe. If Tweens stay late after school for various sport activities or clubs, the parent(s) and the Tween have a way to communicate with each other.
Secondly, many parents work and children may have to stay home alone. The access to a cell phone is very important today, it provides a sense of security, so the parent and child can feel safe.
The argument by Linda Sidner, focuses on web sites that tweens may access that are inappropriate. Also, she spoke of cyberbullying, which also is in appropriate.