Why won't Verizon allow me to access Wordpress backend?

[christopherhopper]

I'm Managing Partner of a marketing and design firm. We recently made the switch of all company phones from AT&T to Verizon. But now we've hit a major snag, one I'm hoping has a simple solution.

We design all our sites using Wordpress. However Verizon will not allow us to access any backend login routes for any of our client sites:

A.) iOS - Safari: /wp-login.php yields expected login screen with username and password prompt; upon entering creds, there is a ICAP error.

B.) OS - Chrome: /wp-login.php won't even bring up login screen, only a "redirect loop" error.

I thought maybe this was a porting issue, but since we're getting stymied on both iOS and OS avenues, I think now it's a Verizon issue.

Thanks in advance to all those smarter and more beautiful than I am.

. : Christopher

[christopherhopper]

I should mention that reference [B.] above infers that we're accessing the internet via Chrome through tethering wifi connection to iPhone 5.