How to avoid using data on your primary SIM
When you're abroad and using MondoMate eSIM for data, your regular (home) SIM can still use data in the background - and your home operator will charge roaming rates for it. Here's how to prevent that.
Why this happens
Most phones automatically route data through whichever SIM is set as the default. If your regular SIM is still the default data SIM, it will use roaming data. You need to turn off roaming on your regular SIM and set MondoMate as the data SIM.
Step-by-step: disable roaming on your regular SIM
- 1Go to Settings → Mobile Service
- 2Tap your regular SIM (the one with your home number - not MondoMate)
- 3Turn off 'Data Roaming'
- 4Go back and ensure MondoMate eSIM is selected as the mobile data line
- 5Ensure 'Data Roaming' is ON for MondoMate
- 1Go to Settings → Network & Internet → SIM Manager (or Connections on Samsung)
- 2Tap your regular SIM (home SIM)
- 3Turn off 'Roaming' or 'Data Roaming'
- 4Go back to SIM Manager and confirm MondoMate is selected as the preferred data SIM
Keeping data roaming active on your home SIM while abroad can result in significant charges from your mobile operator. Always check this setting before you travel.
Your regular SIM stays active for calls and SMS even with roaming data turned off. You're just preventing it from using data abroad.
Was this article helpful?