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Setup & How-To Guides
Dual SIM iPhones Explained: How to Use Both
Tech Support Team
Oct 10, 2025
Apple's Dual SIM implementation is powerful but can be confusing. Let's simplify it.
Setup Steps
- Label your lines: "Primary" (Home) and "Travel" (eSIM).
- Set "Default Voice Line" to Primary.
- Set "Cellular Data" to Travel.
- Turn "Allow Cellular Data Switching" OFF to prevent accidental roaming.
The Result
You get your iMessage and SMS texts on your normal number, but all map and web browsing data goes through the cheap eSIM. Magic.
Tags:
eSIM