You've landed, you've got your eSIM installed, and... nothing. No data. Here's how to diagnose it.
Step 1: Check which line is active
On iPhone: Settings then Mobile Data then look at "Mobile Data" setting. Make sure it's set to your travel eSIM, not your home SIM.
On Android (Samsung): Settings then Connections then SIM Manager then check which SIM is set for mobile data.
This is the most common issue. The eSIM is installed fine, but the data is still routed through the home SIM.
Step 2: Enable data roaming on the eSIM
On iPhone: Settings then Mobile Data then tap your eSIM plan name then Data Roaming then On.
On Android: Settings then Connections then Mobile Networks then Data Roaming then On (make sure this is for the eSIM line, not your physical SIM).
Without data roaming enabled, an eSIM on a foreign network won't work - even though you're supposed to be roaming by design. This catches a lot of people.
Step 3: Toggle Airplane Mode
Turn Airplane Mode on, wait 15 seconds, turn it off. This forces your phone to re-register on the available network. Often resolves connection issues that persist after step 1 and 2.
Step 4: Check the APN settings
Some eSIM plans require manual APN (Access Point Name) configuration. Your provider should have sent the APN details with your purchase confirmation. On iPhone: Settings then Mobile Data then eSIM plan then Mobile Data Network. On Android: Settings then Connections then Mobile Networks then Access Point Names.
If the APN fields are blank or wrong, your data won't route correctly even if your signal is showing full bars.
Step 5: Restart your phone
Simple and effective more often than it should be. Full power off, not just a restart. Leave it off for 30 seconds, then back on. Cellular registration happens fresh from boot.
Step 6: Check your plan is still active
eSIM plans have validity periods. If you've been at your destination for a few days, check whether the plan has expired or the data has run out. Log into your provider's account or check the confirmation email for the plan details.
Step 7: Manual network selection
If your phone is trying to connect to the wrong local carrier, force it to select manually. On iPhone: Settings then Mobile Data then Network Selection then turn off Automatic then select the correct network from the list. On Android: Settings then Connections then Mobile Networks then Network Operators then Search manually.
Your eSIM provider's support documentation should list which local networks the plan uses in each country.
The "it worked yesterday but not today" problem
This one trips up a lot of travellers. Your eSIM was working fine, you went to sleep, and this morning nothing connects. The most likely culprits: your phone connected to hotel WiFi overnight and when WiFi dropped, it didn't switch back to cellular properly. Or you crossed into a new area where a different carrier has stronger signal but isn't supported by your plan.
Fix: toggle airplane mode on and off. If that doesn't work, go to network selection and manually pick the supported carrier. Your eSIM provider's email or app should list which carrier to select in each country.
Country-specific quirks
Some countries have specific issues worth knowing about. In China, certain Google services don't work regardless of your eSIM (that's the Great Firewall, not your connection). In India, some eSIM plans take up to 24 hours to fully activate due to telecom regulations. In Japan, eSIM data plans are data-only and won't show a phone number - this is normal, not a malfunction.
Turkey requires a device registration (IMEI registration) for phones used with local SIMs for more than 120 days, but this doesn't apply to short-term eSIM roaming plans. If someone tells you to register your IMEI for an eSIM visit under a month, that's incorrect.
Preventive measures before you travel
Most eSIM problems are avoidable with 5 minutes of preparation at home. Install the eSIM profile while you still have WiFi. Enable data roaming on the eSIM line before you fly. Test the network selection settings. Screenshot your eSIM provider's support email and APN settings. If your eSIM plan came with installation instructions, save those to your phone's notes app - you'll want them accessible offline if something goes wrong after landing.
The single best thing you can do: install and configure everything at home, then toggle airplane mode to simulate landing. When you turn airplane mode off, your phone should connect to your home network via the eSIM. If it does, you know the profile is installed correctly and the settings are right. The only variable left is which foreign network it connects to at your destination.
When to contact support
If you've gone through all seven steps and nothing works, it's time to reach out. Before contacting support, gather: your order reference number, your device model and OS version, a screenshot of your cellular settings showing the eSIM line, and the exact error message (if any). This info speeds up troubleshooting massively.
Most eSIM issues on getesimonline.com can be resolved without reinstalling the eSIM profile. Support can check from their end whether the plan is activated, which network it should connect to, and if there's a backend issue. Reinstalling should be the last resort since some eSIM QR codes are single-use.