How To Switch Between An eSIM & SIM For Data On iPhone

Want to use mobile data more flexibly on your iPhone? Whether you’re managing work and personal data separately or trying to cut costs while abroad, switching between an eSIM and a physical SIM for mobile data is simpler than it sounds. Here’s your step-by-step guide – plus a few smart tips for business users.

Quick recap: What’s an eSIM, and how does it work?

An eSIM is a digital version of the traditional plastic SIM card. Instead of popping it into a slot, it’s built right into your phone and activated with a QR code or an app. It connects to your mobile network just like a physical SIM – but without requiring any fiddly hardware.

On an iPhone, you can use both a physical SIM and an eSIM at the same time, which means you can benefit from two mobile plans on one device. It’s perfect for freelancers or those running companies who need to juggle business and personal lines on a regular basis.

New to eSIMs? Find out more about what eSIMs are and how they work.

Why use eSIM and dual-SIM features for business on iPhone?

If you run a business or work on a freelance basis, separating your data use for your work and personal life can bring a range of benefits. This is the ideal setup to help you to:

• Track mobile data costs across two lines more clearly.
• Avoid unexpected bills by setting up your personal use for one plan, and business use for another.
• Add a local data plan via eSIM when travelling, without removing your UK SIM.
• Use the strongest network available by switching data between SIMs.
• Take advantage of network-specific perks (such as faster speeds or better business plans) that are offered by multiple providers.

In short, it’s a more flexible, professional way to manage your mobile data usage – and stay in control.

How to switch between an eSIM and SIM for data on iPhone

Here’s how to switch between SIMs when using mobile data on your iPhone:

1. Open Settings on your iPhone.
2. Scroll down and tap Mobile Service if you’re in the UK (or Cellular if you’re in the US).
3. Tap Mobile Data.
4. You’ll see both your physical SIM and eSIM lines listed. Tap the one you want to use for data.
5. Your iPhone will immediately switch to using that line for mobile data.

Top tip: You can also toggle the Allow Mobile Data Switching setting (just below the Mobile Data option). If this is switched on, your iPhone will automatically switch between SIMs based on signal strength and data availability.

How to switch SIMs for just one call

Using an eSIM for data can be a smart move in situations like these:

• Travelling abroad. On iPhone, you can add a local eSIM data plan for business trips, so you don’t rack up roaming charges on your UK SIM.
• Working across multiple locations. It’s easy to switch to the SIM with the best coverage in your area. This is especially useful if one network has a patchy service.
• Avoiding peak usage limits. Use a work SIM with a larger data allowance during busy periods, and switch back to your personal line when you’re off-duty.
• Using time-limited plans. Some data-only eSIMs offer affordable daily or weekly rates – ideal for short projects or events.

Some networks also offer data-only eSIMs, perfect for short-term business needs, or if your company provides a separate line for calls.

Troubleshooting: Common issues when switching SIMs for data

• Not seeing both SIMs listed?

Check that both your physical SIM and eSIM are active. Go to Settings, then Mobile Service and make sure both lines are turned on.

• Data not working after switching?

Sometimes your network settings need a nudge. Try toggling Airplane Mode on and off, or restarting your phone.

• Accidentally using the wrong data line?

Make sure that ‘Allow Mobile Data Switching’ is turned off if you want full manual control. This stops your iPhone from switching automatically between SIMs.

• Roaming when you didn’t mean to?

Go to Settings, then Mobile Service, then select either your eSIM or SIM line and make sure that Data Roaming is toggled off. This prevents unwanted charges when travelling.

• Seeing slow speeds after switching?

Check your signal strength and make sure that the selected SIM has an active data plan. You can also reset network settings under Settings, then General, then Transfer or Reset iPhone, then Reset Network Settings.

Tips for business owners: Managing data with dual SIMs on iPhone

• Rename your SIMs. iPhones allow you to name each line so you always know which is which. Go to Settings, then Mobile service. You can then give each SIM or eSIM a name, such as ‘Work’ or ‘Personal’, so you can easily tell them apart.
• Monitor data usage per SIM. If you want to see how much data each line has used (this is especially useful for budgeting purposes), go to Settings, then Mobile Service, then Mobile Data Usage.
• Control which apps can use data. You can restrict certain apps to using Wi-Fi only, which can help limit background data use and prevent any unexpected charges. Go to Settings, then Mobile Service, then scroll through the app list to make any changes.
• Use Focus modes and reminders to stay in control. Set up Work and Personal Focus modes to manage which notifications come through during specific times, helping you separate work and personal life. You can also use iPhone Shortcuts or Calendar alerts to remind yourself to switch mobile data between SIMs at the beginning or end of the day – handy if you prefer to stay in control manually.

Switching between an eSIM and physical SIM for data on an iPhone is a quick win for business owners looking to manage their data usage flexibly, reduce roaming charges, and keep their work and personal use separate. With just a few taps in Settings, you’re in full control – no extra devices needed.

Get set up with a YourBusinessNumber eSIM today

With YourBusinessNumber, setting up a business eSIM is fast, flexible, and completely digital. Once you sign up, you’ll receive your mobile number and QR code via email – ready to scan and activate straight away. Most users are up and running in 15 minutes or less.

Whether you’re switching data plans to save money abroad or just want to streamline your business communication, we make it easy. And if you’re not ready to go fully digital, our virtual WhatsApp Business numbers are the perfect way to start – giving you a professional presence without the hassle of a second phone or SIM card.