Frequently Asked Questions
Answers about eSIM compatibility, installation, activation, data usage, and troubleshooting.
What is an eSIM?
An eSIM is a digital SIM profile built into compatible devices. It lets you add a mobile data plan without inserting a physical SIM card. Your device must support eSIM and be carrier-unlocked.
How do I check whether my Android device supports eSIM?
Open Settings and look for a SIM Manager, Mobile Network, or Add eSIM option. On many Android devices, you can also dial *#06# and check whether an EID is shown. If an EID appears, the device has eSIM capability.
How do I check whether my iPhone or iPad supports eSIM?
Check your device model, regional variant, and carrier lock status in Settings. Some models sold in specific regions may not support eSIM even if the same model does elsewhere. Your device must also be carrier-unlocked.
Can I use Personal Hotspot or tethering?
Yes, if both your device and the selected eSIM network support hotspot or tethering. Availability can vary by plan and network.
When does my eSIM data plan expire?
Validity normally begins according to the activation policy shown for the plan and ends after the stated validity period, or earlier if the included data is fully used. Some plans activate when they first connect to a supported network, while others may activate on installation.
How do I buy an eSIM on byOne?
Choose your destination, select a plan, confirm device compatibility, enter your email, and complete checkout. After successful payment, installation details will be made available through your byOne account and supported delivery channels.
How do I install an eSIM on iPhone?
Make sure your device is compatible, carrier-unlocked, and connected to stable internet. You can install an eSIM using a direct method, QR code, or manual installation details, depending on the plan.
How do I install an eSIM on Android?
Make sure the device supports eSIM and has a stable internet connection. Open the SIM or Mobile Network settings and add an eSIM using a QR code or manual activation details, depending on the device and plan.
Can I reinstall an eSIM after deleting it?
Many eSIM profiles can only be installed once. Do not delete an eSIM that you may still need. If an eSIM is deleted, reinstallation may not be possible.
Can I keep using my primary phone number?
Yes, on devices that support Dual SIM functionality you can usually keep your primary SIM active while using the byOne eSIM for mobile data. Your primary carrier may still charge for calls, texts, or roaming depending on its plan.
Can I use iMessage with an eSIM?
Yes. After installation, you may need to confirm which line is used for iMessage, FaceTime, calls, and mobile data in your device settings.
What should I do if I cannot scan the QR code?
Use the manual installation details provided with your eSIM, if available. Make sure your internet connection is stable and that the eSIM has not already been installed.
What does 'This code is no longer valid' mean?
The eSIM may already be installed, the activation code may have been used, or the installation may have been interrupted. Check whether the eSIM is already present on your device before trying again.
What should I do if my connection is slow?
Try toggling Airplane Mode, restarting mobile data, confirming roaming is enabled for the eSIM, checking the APN settings, or manually selecting another supported network if your plan allows it.
What is an APN and when do I need to change it?
An APN (Access Point Name) tells your device how to connect to mobile data. Some eSIM plans configure it automatically, while others require you to enter the APN shown in the installation instructions.
Can I top up the same eSIM?
Yes, if the eSIM supports top-up and remains installed on your device. If a plan does not support top-up, you may need to purchase a new eSIM package.
Can some apps or websites behave differently when using a travel eSIM?
Yes. Some services apply location, security, proxy, or network-routing restrictions. This can affect access even when the eSIM connection itself is working normally.
How can I avoid roaming charges on my primary SIM?
Use the byOne eSIM for mobile data and disable data roaming on your primary SIM. Review your primary carrier settings carefully so it does not use mobile data while abroad.
Why don't I see 5G?
5G depends on your device, the selected eSIM plan, network coverage, and local availability. If 5G is supported, check your preferred network settings and confirm you are in a 5G coverage area.
Which destinations are available?
byOne offers local, regional, and global coverage from the current catalogue. Use the eSIM catalogue or destination search to see available plans for your trip.
