EDGE not working on EDGE enabled fones?

I dont get this. I got myself a N72, and it doesnt work on EDGE even though its a Class 10 EDGE enabled cellphoneI also have a 6070, its also EDGE enabled but EDGE doesnt work

A W810i works and so does a N73, but wth is wrong with the above phones ? :S

The W810i and N72 are BOTH Class 10, 236.8 kbps phones.

Connection in question was a ZONG.

man edge has two reqs

1. edge enabled phone

2. edge enable cellular tower in your area....

may b u dont have 2nd one