Why Is My eSIM Not Working? Troubleshooting Tips

Essentials to know

• Common causes of eSIM issues – Problems often stem from poor network coverage, incomplete activation, device incompatibility, outdated software or carrier settings, or account and plan errors.
• Step-by-step troubleshooting – Check if your phone is unlocked, confirm signal strength, verify eSIM activation, ensure compatibility, update software, toggle your eSIM line, and contact your network provider if needed.
• Advanced fixes – Adjust APN settings, reset network configurations, or perform a factory reset (as a last resort) to resolve stubborn connectivity problems.
• When to seek professional help – Contact your provider if you’ve deleted your eSIM, suspect a device hardware issue, or see persistent errors like “No SIM” after activation.
• Preventing future problems – Keep your software updated, store QR codes securely, avoid deleting eSIM profiles unnecessarily, and use trusted Wi-Fi when activating.

For small business owners, eSIMs offer a fast, flexible way to stay connected without the need for physical SIM cards or extra devices. But what happens when that super convenient solution stops working?

If your eSIM isn’t connecting properly, it can be frustrating – especially when your business relies on staying reachable (and let’s face it, most businesses these days do). From missed client calls to delayed responses, even a short eSIM outage can cause all kinds of business-related headaches.

Luckily, most eSIM issues have simple fixes. Let’s walk through what could be going wrong – and how to get your phone plan up and running again, fast.

Common reasons your eSIM isn’t working

More often than not, one of the reasons below will be the culprit that explains why your eSIM isn’t working as it should. Take a look through these frequent issues, then read on for our step-by-step guide to set them right.

Poor or no network coverage

Your eSIM may be active, but if you’re in a location with poor mobile coverage, your phone simply won’t connect to the network. This is especially common in rural areas or in some buildings, where the signal may be weaker.

Incorrect eSIM activation

Did you scan the QR code but skip a step during the activation process? If your eSIM wasn’t fully installed or activated, it won’t connect to the network – even if it looks like it should.

Device compatibility issues

Most modern smartphones, including recent iPhones and Android devices, do support eSIM – but if you’re using an older model, it might not be compatible. In some cases, specific software versions or carrier settings are also required for eSIM functionality. If your phone isn’t compatible, the eSIM won’t work as expected.

Outdated software or carrier settings

Running an older version of iOS or Android can get in the way of your eSIM working properly. The same goes for outdated carrier settings – your phone needs the latest information to recognise the eSIM and connect to the network without issues. It’s well worth keeping on top of those updates to avoid any unnecessary hiccups.

Account or plan issues

If your mobile plan isn’t active, has expired, or hasn’t been properly linked to your eSIM, you won’t be able to access calls, texts or data – even if everything else looks fine from your side. In this case, it’s a good idea to get in touch with your network provider, who can check your account status, confirm if the eSIM is correctly linked, and help resolve any plan or billing issues.

Step-by-step troubleshooting guide

Before you panic, try these quick checks:

• Is your phone software up to date?
• Is data roaming enabled (especially when travelling)?
• Is your eSIM profile toggled on?
• Are you in an area with good signal?

Then follow this step-by-step guide to pinpoint what’s going wrong with your eSIM:

1. Is your phone unlocked?

Some devices are carrier-locked, meaning they can only use eSIMs from a specific provider. To check on an iPhone, go to Settings > General > About and scroll to ‘Carrier Lock’ or ‘Network Provider Lock’. If it says ‘No SIM restrictions’, your phone is unlocked.

For an Android device, the exact process will vary depending on which phone model you have. To check if your Android phone is unlocked, go to Settings > Connections or Network & Internet > Mobile Network > Choose Network or Automatically Select Network. If your phone displays several available networks, it’s unlocked. If you can only select one, it’s likely locked to that provider.

Phones bought through network contracts may be locked. If this is the case, you’ll need to contact your provider first to unlock the device before using an eSIM from another network.

2. Check network signal & coverage

Next, check whether a network coverage issue is affecting your eSIM performance. iPhone users can check their signal strength by looking at the bars in the top-right corner of the screen. For a more detailed view, dial 3001#12345# and press call to open Field Test Mode, which provides numeric signal strength readings – in particular, look at the RSRP number.

On Android, signal bars are typically displayed at the top of the screen too. You can also go to Settings > About Phone > Status > SIM Status to view signal strength in dBm – a higher negative number (e.g. -100 dBm) means a weaker signal, while a lower negative number (e.g. -60 dBm) indicates a strong signal.

If the signal seems weak, try toggling Airplane Mode on and off to reset your connection. Restarting your device can also help force a fresh connection to the network.

You might also want to try selecting a network manually. On iOS, go to Settings > Mobile Service or Cellular > Network Selection > Disable Automatic and select your network manually. On Android, go to Settings > Connections > Network Operators and manually choose your preferred network from the list.

If all else fails and you’re in an area with weak mobile signal, you might have to move locations to get your eSIM working again.

3. Verify eSIM activation steps

If an eSIM activation error is to blame, you’ll need to make sure you scanned the correct QR code provided by your network. A stable Wi-Fi connection is essential here – if your internet cuts out during the setup, the eSIM profile might not install correctly.

Try scanning the QR code in a well-lit area and ensure your phone’s camera is focused. Then follow all on-screen prompts until the process is complete. Once you’ve done this, head to your phone’s settings to confirm the eSIM is listed and active. It should be marked as either “Active” or “Pending Activation”.

4. Ensure your device supports eSIM

It might seem obvious, but it’s worth checking that your phone is eSIM-compatible. Most modern smartphones – including iPhones XS and later (plus SE 2nd and 3rd gen), Samsung Galaxy S20 onwards, and Google Pixel 4 and up – do support eSIM. But if you’ve got an older model, that might be the root of the problem.

To find out if your iPhone supports eSIM, go to Settings > General > About and look for a number listed under ‘EID’. If there’s no EID, the phone likely doesn’t support eSIM. If your phone was bought outside the UK – especially in China, Hong Kong or Macao – it may also lack eSIM functionality even if the model normally includes it when purchased in other regions. You can also check by going to Settings and looking for an option to “Add eSIM” or “Add Mobile Plan” – if you can’t find that, your device may not be compatible or could be region-locked.

The process is similar for Android users, but the exact steps vary depending on your phone’s manufacturer. As a general guide, go to Settings > Connections or Network & Internet > Mobile Network > Choose Network or Automatically Select Network. If your phone shows several available networks, it’s likely unlocked and supports eSIM. If only one appears, it may be locked or not support eSIM.

If in doubt, it’s worth checking your device’s specifications on the manufacturer’s website or contacting your network provider for clarification.

5. Update software & carrier settings

First, head to your device settings and make sure you’ve updated to the latest available operating system – you’ll need at least iOS 12.1 or the Android equivalent for eSIM to work properly.

While you’re there, keep an eye out for any available carrier settings updates, which often pop up as prompts during or after a system update. Once everything’s updated, restart your phone to make sure the changes take effect.

6. Toggle your eSIM line on and off

Toggling your eSIM line off and back on can help resolve temporary glitches or connectivity issues, as it forces your device to reset its mobile network connection. Here’s how to do it:

• On iOS: Go to Settings > Mobile Data > Select your eSIM > Toggle ‘Turn On This Line’ off and then back on.
• On Android: Go to Settings > Connections > SIM Manager > Toggle the eSIM off and then on.

7. Reach out to your network provider

If none of the above steps resolve your issue, your best bet is to contact your mobile network provider directly. They can check for any account problems, help with eSIM profile reactivation, or guide you through more specific fixes tailored to their service. If you’re using a YourBusinessNumber eSIM, our support team is always here to help too – we’ll walk you through the next steps to get you back online quickly.

Advanced fixes for persistent eSIM issues

eSIM still not working as you expect it to? Try these additional fixes:

Check your APN settings

Some carriers require specific Access Point Name (APN) settings to enable mobile data. If your phone doesn’t connect to the internet despite the eSIM being active, go to:

• iOS: Settings > Mobile Data > Mobile Data Network
• Android: Settings > Connections > Mobile Networks > Access Point Names

Get the correct APN details from your provider’s website or support team and ensure these are entered correctly. If more than one APN is listed, choose the one that matches your provider’s instructions.

Reset network settings

On both iPhone and Android devices, go to Settings > General > Reset > Reset Network Settings. This will wipe Wi-Fi, VPN and mobile settings, so make sure you have login info saved before you proceed.

Factory reset (as a last resort)

If all else fails, a factory reset may solve persistent issues caused by deeper system conflicts – but this will erase all your data. Always back up your phone before doing this.

• iOS: Settings > General > Transfer or Reset iPhone > Erase All Content and Settings
• Android: Settings > System > Reset > Factory Data Reset

Top tip: Should you remove and reinstall the eSIM profile?

If you’re struggling with persistent eSIM issues, you might be tempted to delete the eSIM profile and re-scan the original QR code. However, we recommend holding off on doing this until you’ve spoken to your provider – especially if you’re using a YourBusinessNumber eSIM. Once you’ve deleted the eSIM, the QR code may no longer work, and generating a replacement can take time, depending on the network. It’s always best to contact support first to avoid unnecessary delays – and only delete your eSIM if you’re instructed to by your network provider.

When to seek professional help

Sometimes you have to call in the professionals to help get your eSIM back up and running. Here are some common scenarios that might mean you need extra support from your network provider:

Accidentally deleted your eSIM?

If you’ve removed the eSIM profile from your phone or lost the QR code, don’t worry. Most network providers allow you to request a new QR code or activation credentials – and some can even push a fresh eSIM profile directly to your device over the air. If you’re using YourBusinessNumber, just get in touch with our support team and we’ll send new setup details to get you connected again.

Could it be a device issue?

If you’ve tried everything and your eSIM still won’t connect, there may be a hardware fault. It’s worth checking in with your phone’s manufacturer to rule out any software bugs or hardware issues that might be interfering with your eSIM. Sometimes, the problem lies with the device itself rather than the eSIM or network settings.

Look out for these red flags:

• Your eSIM disappears from device settings.
• You receive a ‘No SIM’ or ‘Invalid SIM’ error.
• You’ve activated the eSIM, but still can’t access calls, texts, or data after 24 hours.

Need help fast? The best step is to get in touch with your network provider. They’ll be able to check your account, reset your connection, or reissue your eSIM details if needed. If you’re using YourBusinessNumber, our support team is also on hand to help you get reconnected as quickly as possible.

Preventing future eSIM problems

Once you’re up and running again, a few smart habits can help avoid issues next time. Follow these best practices for using eSIMS:

• Always keep your phone software up to date.
• Don’t delete your eSIM profile unless instructed to by your network provider.
• Store your original QR code safely in case you need to reinstall it.
• Use a secure, trusted Wi-Fi connection when activating your eSIM.

Not ready for eSIM? Try a virtual number instead

Still weighing up whether eSIM is right for you? If you’re after a simple, secure way to manage your business communications, YourBusinessNumber offers flexible solutions to suit your needs – including both business eSIMs and virtual numbers for WhatsApp Business.

With a YourBusinessNumber virtual number, you’ll receive your new WhatsApp Business number by SMS – ready to activate in minutes. It’s a smart choice for freelancers, sole traders or small teams who want to keep work and personal contacts separate, without juggling two phones or SIM cards.

You’ll also get UK-based support tailored to the needs of small business owners – so you can focus on running your business, not managing your tech. Whether you’re just starting out or scaling up, we’ve got the tools to help you stay connected and professional from day one.