Installing uverse Internet with third party router and modem

@Roscos   You will not be able to disconnect the ATT RG (modem/router) and depends on what RG you have to put the 3rd party router in DMZ zone/IP Passthrough.

Chris
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Please NO SD stretch-o-vision or 480 SD HD Channels
Need Help? PM ATT Uverse Care (all service problems)
ATT Customer Care(billing and all other problems)
Your Results May Vary, In My Humble Opinion
I Call It Like I See It, Simply a U-verse user, nothing more

I just asked the same question:

Where is the Third Party NON-AT&T U Verse Wi-Fi Modem list

and ATT employee replied:

All Uverse accounts require authorization using a certificate only available on Uverse gateways.

You may purchase and use a 3rd party device behind the gateway placed in either DMZ mode or IP Pass Thru (depending on gateway received) but the way Uverse gateway must be first.

If you have not purchased U-verse Equipment from AT&T or if previously purchased U-verse Equipment is beyond the one (1) year warranty period (from date of installation) and requires replacement, then you agree to pay a monthly equipment fee for the U-verse Equipment, as part of your purchase of or continued use of the Service and/or other U-verse services.

THEN THEY, AT&T CLICKED THIS AS AN ACCEPTED SOLUTION!!!!

Tough if you don't accept THEIR reply as a solution!

I don't think AT&T can force us to only buy or rent their equipment, that's a monopoly!

So I went to Netgear Community and asked the question today...

Waiting for an answer now.