雙SIM模式下 eSIM流量被搶用怎麼辦？完整解決方法與設定教學

What to do when eSIM data is used up in dual SIM mode? Complete solution and setup guide

More and more users are opting for "physical SIM + eSIM" or "dual eSIM" configurations. However, many have found that even after setting their eSIM as the data source, traffic is being used by the other SIM, leading to increased roaming charges or abnormal network speeds. This article will delve into the reasons behind this issue and provide practical solutions.

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Why is eSIM data being 'stolen'?

In dual SIM mode, most phones (e.g., iPhone, Android) use "Dual SIM Dual Standby (DSDS)" technology, meaning that only one mobile data network can be used at a time.

This implies:

  • The phone will set a "primary data SIM"
  • The system may automatically switch data sources due to signal, calls, or settings
  • eSIM is not always prioritized

Additionally, if "Allow Mobile Data Switching" is enabled, the system will automatically switch to another SIM based on network quality, leading to data being 'stolen'.

Common Scenarios: Why does eSIM data suddenly disappear?

Here are a few common reasons:

1. Incorrect default data card setting
If the eSIM is not set as the "mobile data," the phone may still use the physical SIM for internet access.

2. Automatic data switching enabled
When the primary SIM signal is weak, the system automatically switches data sources.

3. Data interrupted during calls
Dual SIM phones usually cannot handle data and calls on both cards simultaneously, which may cause the eSIM to pause.

4. Incorrect hotspot sharing source
Phone hotspots will only use the "current data SIM"; if set incorrectly, it will consume data from the other card.

Solution: Prevent eSIM data from being 'stolen'

The following settings can effectively resolve the issue:

✔ Set eSIM as the primary data card

  • iPhone: Settings → Cellular → Cellular Data → Select eSIM
  • Android: Settings → SIM card management → Default data → Select eSIM

✔ Turn off "Mobile Data Switching"
Avoid the system automatically switching to another SIM.

✔ Turn off data function for non-essential SIMs
You can directly disable mobile data for the physical SIM to ensure traffic only goes through the eSIM.

✔ Check hotspot settings
Ensure that when sharing internet, the source is eSIM and not another SIM.

Best Dual SIM + eSIM Usage Recommendations (A must-read for travelers)

According to industry recommendations, the ideal configuration is:

  • Main SIM: For calls and SMS (e.g., bank verification)
  • eSIM: Dedicated for internet data

This can effectively avoid high roaming charges and improve usage stability.

Conclusion: Correct settings maximize eSIM benefits

Dual SIM + eSIM is the best solution for modern travel and cross-border work, but improper settings can lead to data misuse. Just grasp the following key points:

  • Designate eSIM as the sole data source
  • Turn off automatic switching function
  • Regularly check phone network settings

This will help avoid unnecessary costs and network speed issues.

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