eSIM Troubleshooting: Common Problems and How to Fix Them

If the QR code won't scan, first check that your camera lens is clean. If the QR code appears too small, zoom in or display it on a different device. If scanning still fails, you can enter the activation code (SM-DP+ address) manually instead of scanning.

Installation errors are often caused by unstable internet. eSIM profile downloads require a WiFi connection — mobile data alone may not work reliably. If your WiFi signal is weak, move to a location with a stronger connection and try again.

An error message saying the QR code has already been used means it was activated on another device. eSIM QR codes are typically single-use. If you accidentally deleted the profile, contact your eSIM provider to request a replacement code.

If your eSIM is installed but you have no data, the most common cause is data roaming being turned off. Most travel eSIMs require data roaming to be enabled. On iPhone, go to Settings, then Cellular, select your travel plan, and toggle Data Roaming on. On Android, find the corresponding SIM settings and enable roaming.

Next, verify that your phone is using the correct line for mobile data. Go to Settings, then Cellular, then Cellular Data, and make sure the travel eSIM is selected. A common mistake is forgetting to switch from the primary line.

If you still cannot connect, toggle Airplane Mode on for 10 seconds, then turn it off. This resets the network connection and forces your phone to reconnect to local carriers. Restarting the device can also help. Some providers require specific APN settings, so check the setup email from your eSIM purchase.

If your eSIM connection feels slow, start by checking the signal strength at your location. Underground areas, rural regions, and heavily crowded areas naturally have weaker signals. Moving near a window or going outside often improves speed significantly.

Resetting network settings can also help. On iPhone, go to Settings, then General, then Transfer or Reset iPhone, then Reset, then Reset Network Settings. Note that this will erase saved WiFi passwords, so use it as a last resort.

Your data plan may have reached its limit, triggering speed throttling. Check your remaining data through your eSIM provider's app or website. If data is exhausted, consider purchasing a top-up or upgrading your plan. Turning off background app refresh, automatic updates, and cloud backups can also help conserve data for essential use.

When using both a physical SIM and eSIM, incorrect line assignment is a common source of problems. The typical setup for travel is to use the eSIM for data and the physical SIM for voice calls. Make sure your Cellular Data setting points to the travel eSIM.

Having both SIMs active simultaneously can increase battery drain on some devices. If you do not need to receive calls on your home number, consider temporarily disabling the physical SIM line. If you do want incoming calls, keep the physical SIM active but switch data to the eSIM only.

If your eSIM plan is data-only (no phone number included), calls and SMS will not work on that line. Make sure voice and messaging are routed through your physical SIM. Apple services like iMessage and FaceTime should also be checked to ensure they are using the correct line.