What happens when my data plan runs out?
When you use up your data allowance, your connection stops until you top up or purchase a new plan. You can top up directly from the eSIMno Center while connected to Wi-Fi, or buy a new plan if your validity period has expired.
Can I use my SIM card and eSIM at the same time?
Yes. On dual-SIM devices (most modern iPhones and Android phones), you can run your physical SIM and the eSIM simultaneously. Use your home SIM for calls and SMS, and the eSIM for mobile data. Keep in mind that leaving your home SIM active may trigger roaming charges if you use it for calls or texts abroad.
What should I do if I lose my activation QR code?
You can't really lose it - your QR code is in your order confirmation email, and also in the install pop-up on the website. To reopen it any time before activation, tap "Install eSIM" in your order email, or sign in at esimno.com and go to Profile > My eSIMs > Install. Both show the QR code together with the one-tap install link and the manual SM-DP+ / activation code. Note the install codes are one-time-use: once the eSIM is installed on a device they can't be reused - reopen the installer (My eSIMs > Install) to display a fresh QR if you need one.
Will the eSIM work on my iPad?
Yes, if your iPad model supports eSIM. iPad Pro (3rd generation and later), iPad Air (3rd generation and later), iPad mini (5th generation and later), and standard iPad (7th generation and later with cellular) all support eSIM. Installation works the same way as on iPhone.
What smartphones support eSIM?
Most modern devices support eSIM, including iPhone XS and later, Samsung Galaxy S20 through S25 series, Google Pixel 4 and later, Huawei P40 and later, and many recent iPads. Check our full compatibility list before purchasing to confirm your device is supported.
Can I use the eSIM right after purchase or do I need to wait?
Yes - you can install it immediately after purchase. Your order email arrives within minutes and contains the QR code, a one-tap install link and the manual codes, plus an "Install eSIM" button; you can also sign in > My eSIMs > Install any time. Installing right away does not start your plan - the validity countdown only begins when the eSIM connects to a mobile network inside your plan's coverage area. Keep the eSIM line and Data Roaming off until you are ready to start; if your plan covers the country you are in right now, turning the line on starts the countdown immediately.
How can I check my data usage?
Log in to the eSIMno Center on our website or mobile app to see your remaining data balance and usage history. You can also check usage in your phone's cellular data settings - most devices show data consumed per line.
Can I keep my WhatsApp number while using an eSIM?
Yes. Your WhatsApp number stays linked to your home SIM, so all your chats, contacts, and groups remain unchanged. WhatsApp uses data (not the SIM line directly) for messages and calls, so it works seamlessly over your eSIMno data.
Can I use the eSIM to make video calls?
Yes - apps like FaceTime, WhatsApp, Zoom, Google Meet, and Microsoft Teams all work over your eSIM data. Video calls use about 200-400 MB per hour depending on quality, so factor that into your plan choice if you make long calls regularly.
Can I switch the eSIM to a different phone after activation?
Generally no. Once an eSIM is activated on a device, it's tied to that device. If you switch phones, you'll need to install a new eSIM. Some carriers offer eSIM transfer features, but eSIMno plans don't currently support transfer between devices.
Will the eSIM affect my phone's battery life?
Running two SIM lines (physical + eSIM) uses slightly more battery than one, since the phone monitors both networks. The difference is usually 5-10% over a full day. To minimize impact, disable the line you're not actively using or turn off cellular data on the inactive line.
Should I enable data roaming for the eSIM?
Yes - you must enable data roaming for the eSIM line, even though there are no roaming charges. The eSIM connects to a local partner network and your phone treats this as roaming. Enable it: iPhone > Settings > Cellular > eSIMno line > Data Roaming ON; Android > Settings > Network > SIMs > eSIMno > Roaming ON. This setting only affects the eSIM, not your home SIM.
Hungary / Telenor 
