iD Mobile Roaming in China: What You Need to Know

iD Mobile does not include mainland China in its "Roam Like at Home" or "Roaming Pass" destinations, meaning customers will face significant out-of-bundle charges for data, calls, and texts. To avoid high costs and bypass the Great Firewall, most travelers opt for a dedicated travel eSIM that provides uncensored access to international apps.

Traveling to China is a bucket-list experience for many British tourists, but the technicalities of staying connected can be daunting. Unlike traveling within the EU, where iD Mobile customers can use their minutes and data as if they were in London or Manchester, China is classified as a separate roaming zone. Without a specialized plan, your smartphone could rack up a massive bill before you even leave the airport in Beijing or Shanghai.

The Reality of iD Mobile Roaming in China

iD Mobile, which operates on the Three UK network, offers fantastic value within the UK and Europe. However, their roaming policy for East Asia is less generous. If you land in China and turn on your mobile data, you are essentially using "Pay As You Go" roaming. This is often capped at a certain monetary limit by default, but the rate per megabyte is high enough that a few minutes of Google Maps or an Instagram upload could consume your entire daily budget.

Furthermore, even if you are willing to pay the iD Mobile roaming rates, you may encounter performance issues. Roaming through a UK carrier often results in high latency because your data traffic has to travel all the way back to the UK and then back to China. More importantly, using a standard UK roaming profile does not always guarantee that you will bypass the Great Firewall, the sophisticated system of internet censorship that blocks Google, WhatsApp, Facebook, and Instagram.

Why the Great Firewall Matters

For most travelers, the primary goal is to keep using the apps they rely on at home. In mainland China, local internet service providers block almost all Western social media and search engines. If you buy a local physical SIM card from a kiosk at the airport, you will be subject to these blocks unless you use a VPN (Virtual Private Network). VPNs are notoriously unreliable in China, frequently being throttled or blocked entirely during sensitive periods.

This is where ChinaRoam offers a distinct advantage. Because ChinaRoam data is routed through gateways outside of mainland China, your device is treated as if it is browsing from a neutral location. This means Google Maps, WhatsApp, and Instagram work natively without the need for a separate VPN app. You can see plans that offer this uncensored access across the mainland, Hong Kong, and Macau.

Coverage and Local Carriers

China has some of the most advanced mobile infrastructure in the world. When you use a travel eSIM, you aren't just stuck with one provider; you often have access to the big three state-owned carriers:

• China Mobile: The world's largest mobile network. It has the most extensive coverage, particularly in rural areas and on high-speed trains.
• China Unicom: Known for having excellent compatibility with Western handsets and strong performance in urban centers like Shanghai and Guangzhou.
• China Telecom: Provides robust 5G coverage and is a reliable secondary option in crowded metropolitan areas.

In major cities, 5G is the standard. Whether you are exploring the historic Senado Square in Macau or the bustling streets of Shenzhen, you can expect high-speed connectivity. Even in more remote locations, such as the pedestrian-only Gulangyu Island in Xiamen, 4G and 5G signals remain strong. ChinaRoam plans utilize all three of these networks to ensure you stay connected regardless of your specific location.

Comparison: iD Mobile vs. ChinaRoam eSIM

Feature	iD Mobile Standard Roaming	ChinaRoam Travel eSIM
Cost	High per-MB charges	Fixed-price packages
Censorship	May be blocked	Uncensored (No VPN needed)
Networks	Limited roaming partners	China Mobile, Unicom, Telecom
5G Access	Not guaranteed	Supported on all major networks
Flexibility	Post-paid bill shock	Prepaid; no hidden fees
Number	Keeps UK number (expensive)	Data only (no local number)
Top-ups	Limited	Available via web dashboard

How Much Data Do You Need?

Estimating data usage is crucial when you aren't on an unlimited home plan. China is a very "app-heavy" society. You will likely use Alipay or WeChat Pay for almost every transaction, and Baidu Maps or Amap for navigation (as Google Maps can sometimes be inaccurate in China).

• Light User (1GB - 3GB): Best for a short 7-day trip focusing on emails, occasional map lookups, and WhatsApp messaging.
• Moderate User (5GB - 10GB): Ideal for a 15-day trip involving frequent social media uploads, photo sharing, and constant GPS usage.
• Heavy User (20GB - 50GB): Recommended for 30-day stays, business travelers, or those who plan to stream video and use their phone as a hotspot for a laptop.

ChinaRoam provides a variety of fixed plans ranging from 1GB for a week up to 50GB for long-term stays. If you prefer not to worry about a total limit, daily passes are available, offering high-speed allocations (up to 10GB per day) that reset every 24 hours. These data-only plans do not include a local Chinese phone number, but they fully support WhatsApp and FaceTime calls, which are the preferred communication methods for international travelers.

Setting Up Your eSIM

Before you leave the UK, you must ensure your phone is not locked to iD Mobile or any other carrier. You can check if your device is eSIM compatible by looking for the EID number in your settings. Once you have confirmed compatibility, the setup process is straightforward.

For iPhone Users

1. Go to Settings > Mobile Data.
2. Tap Add eSIM.
3. Scan the QR code provided by ChinaRoam.
4. Label the new plan as "Travel" or "China."
5. Set your iD Mobile line to "Primary" for calls/SMS (if you want to keep it on) and the eSIM as the "Secondary" line for Mobile Data.
6. Ensure Data Roaming is turned ON for the travel eSIM profile.

For Android Users

1. Go to Settings > Network & Internet > SIMs.
2. Tap Add SIM or the "+" icon.
3. Select Download a SIM instead? and scan the QR code.
4. Follow the prompts to activate the plan.
5. In your SIM settings, designate the ChinaRoam eSIM for data usage.
6. Turn ON Data Roaming for the new eSIM.

You can find a more detailed guide on how it works to ensure a smooth transition when you land.

Arriving in China: First Steps

Upon landing at airports like Beijing Capital (PEK) or Shanghai Pudong (PVG), the airport Wi-Fi usually requires a Chinese phone number to receive an SMS verification code. This makes having an active eSIM before you land incredibly helpful. As soon as you turn off airplane mode, your phone will search for the strongest local signal (usually China Mobile or China Unicom).

With your data active, you can immediately book a Didi (the Chinese equivalent of Uber) through the Alipay app. Since your data is routed outside the Great Firewall, you can also message your family on WhatsApp to let them know you’ve arrived safely—something that wouldn't be possible on a standard local SIM without a VPN.

The bottom line

Using iD Mobile roaming in China is an expensive gamble that often results in bill shock and restricted internet access. By choosing a specialized travel eSIM, you secure 5G connectivity on China's best networks while maintaining access to all your favorite apps. It is the most efficient way to navigate the complexities of the Chinese digital landscape without sacrificing the convenience of your smartphone.