We Tested It: 415 Mbps in Shenzhen, Mainland China — With Zero VPN

Every "best VPN for China" list makes the same promise: install this app, pay this subscription, and you'll get past the Great Firewall. None of them show you a speed test. We will.

A Sigma Mobile customer ran a live Speedtest while standing in Shenzhen, Mainland China, on our China Mainland eSIM — no VPN app open, no tunnel, nothing running in the background. The result: 415 Mbps download, nearly half a gigabit per second, on an open, unrestricted connection.

That's not a "best case" or a lab figure. It's one real test, on one real phone, in one of the most heavily filtered internet environments on earth — and it's a number that no VPN sold for use in China comes anywhere close to.

Why No VPN Can Touch This Number

VPNs in China don't fail because the apps are badly built. They fail because of what they're fighting against. A VPN has to disguise and tunnel your traffic past active, deliberate filtering — encrypting it, rerouting it, and constantly adapting as the Great Firewall identifies and blocks VPN protocols. That overhead costs speed, and it costs reliability:

• VPN traffic is actively detected and throttled, often without warning, so your connection degrades right when you need it
• Popular VPN apps are periodically pulled from Chinese app stores, meaning the one you installed at home may not even be available to reinstall if it crashes
• Even the VPNs that do work rarely sustain more than a fraction of local network speed, because every packet is doing extra work to stay hidden
• A dropped VPN tunnel mid-call, mid-stream, or mid-upload is one of the most common complaints from anyone who's tried to work from China on a consumer VPN

Sigma Mobile's China eSIM sidesteps this entire fight. Instead of trying to sneak domestic Chinese traffic past a filter, our China Mainland eSIM routes data through international roaming from the moment it leaves the device — connecting via China Mobile's own international gateway (China Mobile Hong Kong) rather than as standard domestic subscriber traffic. There's no tunnel to detect, no VPN protocol to throttle, and nothing to disguise, because the traffic was never domestic, filtered traffic in the first place. That's the architecture behind the 415 Mbps result — not a workaround, but a different route entirely.

The Speed Test, in Context

We're not claiming every user will see 415 Mbps on every network, at every hour, in every city — mobile network performance always varies with location, congestion, and device. What we are saying is that this is a genuine, unedited result, and it sits in a speed class that no China-compatible VPN service can realistically match. On the evidence we have, Sigma Mobile is very likely the fastest open, unrestricted internet access available to a traveler or resident in Mainland China today.

Uncensored Access to the AI Tools You Actually Use

Speed is only half the story if the apps you need are still blocked. Our AI & Streaming-Optimized eSIM is tuned specifically for the platforms that frustrate travelers and creators most on a standard China connection: ChatGPT, Claude, and TikTok. Instead of timing out or refusing to connect — the usual experience on a filtered domestic network — these tools load and respond the way they do at home, because the connection was never filtered to begin with.

For digital nomads, consultants, and anyone whose workday runs through an AI assistant, that's not a convenience feature. It's the difference between a productive day in Shenzhen and a day spent fighting your connection.

Three China eSIMs, Built on the Same Fast, Open Route

• China Mainland eSIM — our core plan for Beijing, Shanghai, Guangzhou, Shenzhen, and everywhere in between, on the CMCC network with open international routing. Get the China Mainland eSIM →
• AI & Streaming-Optimized eSIM — the same fast backbone, with tuned routing for ChatGPT, Claude, and TikTok. Get the AI & Streaming Optimized eSIM →
• Greater Bay Area eSIM — one eSIM across Mainland China, Hong Kong, and Macau, so a trip that crosses all three doesn't need three separate plans. Get the Greater Bay Area eSIM →

All three are backed by the same thing: Sigma Mobile's own office in Shenzhen and our direct partnership with China Mobile. For full specs, data tiers, and setup steps on each plan, see our complete guide, The Fastest Open Internet in Mainland China — No VPN Required.

(An honest note: network routing, app availability, and local policy can change, and no connectivity method can guarantee access to every service at every moment. We recommend testing the apps you rely on most as soon as you land.)

Frequently Asked Questions

Is the 415 Mbps result typical, or a one-off? It's a real, unedited result from a live test in Shenzhen — not an average or a guarantee. Mobile speeds vary with location, time of day, and network congestion, the same as anywhere in the world. What it demonstrates is the ceiling our open-routing approach can reach, well above anything a VPN connection inside China can sustain.

How is this different from using a VPN with a local Chinese SIM? A VPN has to tunnel domestic Chinese traffic past active filtering, which costs speed and can be throttled or blocked at any time. Sigma Mobile's China eSIM routes your data over international roaming from the start, through China Mobile's international gateway — so there's no filtered domestic traffic to tunnel past in the first place.

Can I really use ChatGPT and Claude in Mainland China with this eSIM? Yes — our AI & Streaming-Optimized eSIM includes tuned routing specifically for ChatGPT, Claude, and TikTok, so they work the way they do outside China instead of timing out.

Do I need a VPN at all with Sigma Mobile? No. Our China eSIMs are built to provide open access without one. Some users still like having a VPN as a backup, but it isn't required for normal use.

Which eSIM should I pick if speed and AI access are my priority? The AI & Streaming-Optimized eSIM runs on the same high-speed CMCC backbone as our standard China Mainland eSIM, with the added routing tuned for AI tools and TikTok — it's the plan most streamers and AI-dependent professionals choose.

Want to see speeds like this on your own trip to China? 👉 China Mainland eSIM · AI & Streaming Optimized eSIM · Greater Bay Area eSIM (China + Hong Kong + Macau)