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Comment by ChemSpider | Hacker News Reader

That time is gone meanwhile. In late 2019 I had a very hard time getting access to my Gmail account, despite trying all the usual workarounds and staying in the best hotels in town. Even non-English news sites were blocked, sites that I could browse freely just a few years ago.

Skype worked ok, but text chat only. Images never arrived.

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Funnily enough, Google Fi worked just fine in late 2019.

I’m wondering if foreign SIM cards are not subjected to filtering.

Foreign SIM cards on globs roaming are not passed through the GFW as traffic is carried back to the ‘origin country’ before being sent to the internet writ large. So IP lookups still think you’re in your original country. I used global roaming when working in China to circumvent the GFW (albeit at high expense for data).

I used Google Fi in early 2020 in China.

iirc it really just depended on where you were... Sometimes Fi let me break through the GFW, but it definitely did not in Beijing.

It should always, because the APNs (gateway for your IP packets) for Google Fi are in the US no matter where you are roaming from. That’s standard fare for any cellular service: you always connect to the internet gateways in your provider’s home country when roaming.

During my last visit using GoogleFI, the mobile phone shows a US IP when running whatismyip. So even though the phone is connected to the local telecom 5G network, traffic is segmented and routed back to the US carrier (T-Mobile in AWS US east IP ranges if I remember correctly) before hitting any website. So phones with GoogleFI sim works like a US client with a bit higher latency. This was really nice, but attempting to tether another device to the phone was a highly frustrating exercise as it did not work reliably whatsoever.

Google Fi, along with many other mobile telecoms, tend to limit the speed that you can attain from tethering, especially when roaming. Since computers don’t usually expect this, programs tend to misbehave on such metered connections.

In fact, I built a tool to specifically circumvent this: https://github.com/nneonneo/iOS-SOCKS-Server. It provides a SOCKS proxy through which you can tunnel any TCP connection, and have the connection appear to originate from your phone (and thus not be subject to the tethering rate limit). I used this when I was in China recently (2019).

From what I read, the way mobile data roaming is designed is basically like a VPN that connects you to your own home provider. Thus if you're roaming in China you don't get the renowned GFW hospitality. That's why some local people use foreign / HongKong sim cards for GFW-less mobile data.

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