[GPT/Offerwalls] 100% Clean AT&T Mobile Proxy Setup Failing on EarnLab & Adscend. IP Rep, Hidden JS Leak, or Physical SIM Issue?

Hey guys,
I've been pulling my hair out over this and could really use some expert eyes. I'm trying to run a standard GPT/Offerwall setup (focusing purely on web offers, no app installs to avoid GAID/Play Store hardware API leaks).
My setup looks flawless on all the standard checkers, but I'm still getting hit with instant "Proxy/VPN detected" walls on high-tier sites like EarnLab and Adscend Media.
My Current Setup:
Device & Connection: Real physical Android phone. I am keeping my real local physical SIM card inside the phone and using its cellular data directly to connect. I am not using a Wi-Fi hotspot or removing the SIM.
Proxy Provider: Gridpanel Dedicated Mobile Proxy (AT&T Wireless, Houston TX, ASN 20057).
Tunneling: NekoBox (FakeDNS enabled, Remote DNS active to plug WebRTC).
Browser: Standard Android Chrome (Using a 'Churn & Burn' strategy: clearing all app data and rotating the IP before every new 3-hour session).
The Leak Checks (Everything looks solid):
Pixelscan: 100% Consistent. No proxy, no masking detected.
BrowserLeaks (WebRTC): Totally plugged. n/a for both local IP (no 172.x or 10.x leaks) and public IP.
BrowserLeaks (DNS): Resolving perfectly to AT&T DNS servers. I explicitly avoided forcing Google (8.8.8.8) or Cloudflare DNS because I want the mobile carrier profile to look 100% organic. No DNS mismatch.
IPv6: Disabled completely.
The Issue:
Despite the network config being completely watertight on paper, the moment I land on EarnLab, I get the banner: "Please disable your VPN or Proxy connection and sign in again." Adscend also gives me an instant generic red error blocking access to the wall.
My Questions for the Vets:
Since I'm keeping my real local SIM card inside the phone, is it possible that my local MCC/MNC or carrier data is leaking through Chrome to these sites, even though I'm strictly doing web offers and avoiding the Play Store entirely?
Is this strictly an IP Reputation / Abuse Velocity issue? Even though it's a premium mobile proxy, are these specific subnets just heavily cooked/blacklisted by MaxMind/Verisoul from other farmers?
For pure web-based offers, is there another deep JS fingerprinting metric on Chrome Android that I'm missing?
Any insights or point in the right direction would be hugely appreciated!

lol same here man. The only actual workaround I have found that passes the TCP/IP and latency checks is renting real physical devices (bare-metal Android/iOS) hosted in US server racks.

Since the phone is physically in the US with an actual carrier SIM, there's no proxy or tunnel to leak. The only downside is the price tag, daily passes are around $20/day, and monthly setups go for around $65 to $120/mo depending on the carrier and data plan.

im strugling to read the structure of that post .

Man, honestly, your setup is no good.

For some reason you are running a real android plus a proxy, and that alone gets you flagged on a bunch of things. For example, when you work through a browser your graphics card gives you away (webgl fingerprint).

DNS / webrtc / blablabla, none of that solves your problems.

I honestly advise you not to bother and to work the way everyone works, through an antidetect plus a proxy.

I'd be careful about assuming there's some hidden JS leak. Platforms usually combine many signals, and sometimes the IP/ASN reputation alone is enough to increase the risk score. I'd compare results across a few different mobile pools before digging deeper into browser internals.

Pixelscan and BrowserLeaks only cover common leaks. Many platforms also evaluate IP reputation, ASN history, traffic patterns, and other risk signals. A clean-looking proxy does not always mean the IP has a clean history. Testing different IP pools and providers is usually the best way to identify the issue.