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Using Your eSIM

Switching between your home SIM and esimple

How to toggle the active data line on iPhone, Pixel, and Samsung — and which settings matter.

Switching Between Your Home SIM and esimple

Once both your home SIM and the esimple eSIM are installed, your phone can use either for data. Switching takes about three taps. Here's how, on each platform.

iPhone

  1. Settings → Cellular.
  2. Tap Cellular Data at the top of the screen.
  3. Pick the line you want. Your home plan if you're back at home, the esimple plan if you're abroad.

The switch takes effect immediately. You'll see a brief "Connecting…" then bars on the new line.

Two settings worth checking on iPhone

  • Allow Cellular Data Switching: keep this off when abroad. With it on, iOS silently falls back to your home SIM if the eSIM signal is weak — which triggers home-SIM roaming charges. Off means the line you picked is the only line used.
  • Default Voice Line: independent of the data line. Set this to your home plan so calls and texts continue to land on your home number even when your data is on esimple.

Android — Pixel

  1. Settings → Network & internet → SIMs.
  2. Tap the SIM you want to use for data.
  3. Toggle Mobile data on. (The other SIM's mobile data toggle will automatically go off — only one SIM can be the data line at a time.)

You can also set Calls and SMS defaults from the SIMs screen — independent of the data line.

Android — Samsung

  1. Settings → Connections → SIM card manager.
  2. Find the Mobile data dropdown.
  3. Pick the SIM you want for data.

Calls and SMS have their own dropdowns on the same screen. Set them to your home SIM and they stay there regardless of which line is handling data.

Android — others

The location of the SIM manager varies, but every modern Android phone has one. Look in Settings for "SIMs," "SIM card manager," "Mobile network," or "Network & internet." Inside, you'll find a switch for which SIM handles mobile data.

Common moments to switch

  • Landing abroad: home → esimple.
  • Boarding a flight home / landing home: esimple → home.
  • Wifi at the hotel is great: no need to switch anything — wifi takes over automatically. Keep the data line on esimple so you don't accidentally use home-SIM data when wifi drops.
  • esimple data ran out and you don't want to top up yet: switch back to home SIM temporarily. Just be aware roaming charges apply.

Common gotchas

  • The phone shows the new line but no data flows. Give it a minute, then toggle airplane mode. The phone sometimes needs a nudge to fully register on the new line.
  • You switched, but data is still slow. That's signal strength, not the switch. Try moving location or check signal troubleshooting.
  • You can't find "Cellular Data" on iPhone. It only appears if you have more than one active SIM. If you only have one, it'll just say "Mobile Data" with no chooser.

If switching consistently doesn't take effect, email support@esimple.ai with your phone model and a screenshot of the relevant settings screen.

Switching between your home SIM and esimple · esimple