Unable to retrieve yahoo mail/gmail from iphone in Verizon fios network

[p1231]

Hi

Have everyone experience this problem?

I have yahoo email app on my iphone and it can retrieve email through ATT 3G network as well as through Cox internet provider(at my mother house).  Whenever I go home, I can not retrieve the email any more.

I try to delete account and recreate in my iphone app.  That did not work.

By the way, it works on chrome at my work desktop except iphone.

Thank you for reading this.  I hope someone can give me some tips.