US 4G Mobile Proxies in United States

Why the carrier matters more than the IP

A US mobile carrier puts between 4,000 and 20,000 subscribers behind a single public IPv4 address via Carrier-Grade NAT. The exact number depends on the carrier, the market, and the time of day — T-Mobile runs the widest pools in dense metros, AT&T's are smaller in the Southeast, Verizon sits between the two. The number matters because the target's per-IP rate limits are designed around it. A retail site that rate-limits at 40 requests per minute per IP is, in mobile terms, rate-limiting at most 1% of the phones sharing that address.

But the carrier identity itself is what the scoring stack actually reads. The three ASNs that drive almost all US bot-defense decisions are:

• AT&T Mobility, AS20057 — high-trust, older ASN, weighted positively on retail and ad-tech scoring. Dominant in Texas, California, and the I-95 corridor.
• T-Mobile USA, AS21928 — post-Sprint merger this ASN absorbed the majority of sub-6 GHz mobile traffic in the US. TikTok, Instagram and Shopify all reference it by name in their first-party data-enrichment pipelines.
• Cellco / Verizon Wireless, AS22394 — tightest CGNAT pools of the three, most conservative routing, best for workflows that need stable geo.

MVNOs (Mint, Cricket, Metro by T-Mobile, Visible) ride on these three host networks but announce under their own ASNs, which changes the trust score in subtle ways. Some platforms downscore Mint and Cricket explicitly; others weight them the same as their host carrier. Proxaro lets you pick host-carrier exits only, or allow MVNO pass-through — the API flag is carrier-host-only=true.

How carrier-level fingerprint stacks score US mobile in 2026

The detection posture on US mobile changed meaningfully between 2024 and 2026. Two shifts worth calling out:

TikTok's US consistency check — since the August 2025 iOS app update, TikTok correlates the advertising ID, device fingerprint, and route to the TikTok edge across a rolling 14-day window. A mobile IP that flips between T-Mobile Chicago and Verizon Atlanta inside that window gets scored as "unstable identity" and will start triggering captcha on content posting, even if the device fingerprint is clean. Lesson: pin to one carrier + one DMA if you're running TikTok ops.

Instagram's ASN weighting — Meta's 2025 integrity rollout ingests MaxMind + their own ASN enrichment and now distinguishes between "carrier ASN + carrier DNS + carrier route" and "carrier ASN announced from a non-carrier path." Laundered mobile IPs (common on cheap non-carrier mobile pools) fail the second check and get shadow-throttled on reach.

Proxaro's 4G pool is operated end-to-end on carrier SIMs with carrier DNS and carrier routes. We don't resell rebrokered mobile IPs announced through third parties.

CGNAT mechanics you should actually know

Three things that catch people:

1. Shared blame is real. Your exit IP is shared with thousands of actual customers. If one of them is running their own scrape against your target, you inherit some of that signal. We rotate aggressively to reduce the window; we don't pretend it doesn't exist.
2. Port exhaustion is a thing. Each CGNAT public IP has a finite port budget. Very high concurrency against the same target from the same IP hits port exhaustion before it hits rate-limits, and the failure mode is confusing. Solution: let the gateway rotate you.
3. Sticky sessions are not truly sticky on mobile. A phone that handshakes to a new eNodeB reallocates through a different CGNAT public IP. Our mobile sticky sessions hold up to 20 minutes in practice; we document 15 to be honest.

Plain-English API

curl --proxy http://USER:PASS@gateway.proxaro.io:7777 \
     --proxy-header "X-PX-Carrier: t-mobile" \
     --proxy-header "X-PX-Dma: 803" \
     --proxy-header "X-PX-Session: sticky-15m" \
     https://example.com

X-PX-Carrier accepts t-mobile, verizon, att, or any. X-PX-Dma takes a Nielsen DMA code (803 = Los Angeles, 501 = New York, 602 = Chicago). X-PX-Session controls rotation — per-request, sticky-15m, or a sticky-<n>s for any value up to 1200 seconds.