What is Dual SIM and How Does It Work?
Dual SIM technology allows your phone to run two SIMs at the same time. One is usually a physical SIM card, and the other is an eSIM that is downloaded and installed digitally onto your phone. According to Apple Support, you can use a physical SIM and an eSIM or even two eSIMs on supported models. Using Dual SIM with an eSIM – Apple Support.
Once both are active, your device can handle two separate lines. Typically, travellers keep their home SIM active for calls and SMS, while the eSIM is used for mobile data in the country they are visiting.
This means you can use maps, messaging apps, emails, browsing, and social media using your Planet eSIM, while your regular number remains available for banking codes, security messages, family calls, and work-related texts.
Which Phones Support Using an eSIM and SIM Together?
Most modern smartphones support dual SIM functionality. For example, Apple notes that iPhone XS, iPhone XR and later support one physical SIM plus an eSIM, and some later models even support two eSIMs. Use eSIM while travelling internationally with your iPhone – Apple Support
Network providers such as Vodafone highlight that an eSIM is a digital SIM installed on the device, and you can create multiple profiles. What is an eSIM and how does it work? – Vodafone UK
If your phone currently uses a physical SIM and supports eSIM, you will usually be able to run both at once. In your phone’s settings you can choose which SIM is used for data, calls, and messages. This gives you total control over how your plan is used.
If you are unsure whether your device supports eSIM and dual SIM, Planet eSIM provides a simple compatibility checker to help you confirm it before purchase.
Why Use an eSIM and a Physical SIM at the Same Time?
Using both together is ideal for travel. Your Planet eSIM can be set as your main data source, which allows you to avoid expensive international roaming from your usual provider. At the same time your physical SIM remains in place to receive any important communications sent to your normal phone number.
This setup is especially useful for:
- Receiving bank verification texts while travelling
- Staying reachable on your regular number
- Using WhatsApp, Google Maps and email without roaming charges
- Separating work and personal use while abroad
It creates a seamless travel experience and removes the need to swap physical SIM cards, or worry about losing your original one.
Will I Still Be Charged by My Home Network?
If configured correctly, you will not be charged for data by your home network. You simply turn off mobile data for your regular SIM and leave it enabled only for Planet eSIM.
You may still receive incoming calls and text messages as normal. However, if you make outgoing calls or send SMS messages from your home SIM while overseas, your provider may apply international roaming charges. Many travellers simply use messaging apps such as WhatsApp or FaceTime to make calls over their Planet eSIM data instead.
In your phone’s settings, you can clearly select:
- Which SIM is used for mobile data
- Which SIM is used for calling
- Which SIM is used for messaging
How to Set Up Planet eSIM with Your Normal SIM Still Active
Setting up Planet eSIM while keeping your existing SIM in place is easy. After purchasing your eSIM plan, you scan a QR code that downloads the eSIM profile onto your phone. Once installed, you simply select Planet eSIM as your preferred mobile data provider.
Your physical SIM can remain in your phone at all times. There is no need to remove it, and you will continue to receive calls and texts as usual.
Planet eSIM also provides clear step-by-step installation guides for iPhone and Android, making the process quick and beginner friendly.
Common Use Cases for Dual SIM
Using two SIMs brings a wide range of practical benefits for travellers, remote workers and business users.
- Keeping your regular number active for two-factor authentication codes
- Using your eSIM for all data while travelling abroad
- Managing both personal and business lines on one phone
- Maintaining contact with local services at home while overseas
This flexibility is one of the reasons why more and more people are choosing eSIM over traditional physical SIM cards.
When Might You Not Be Able to Use Both?
If your phone is locked to a network provider, it may not allow an eSIM from another carrier. In this case, you would need to contact your mobile provider to request an unlock before installing Planet eSIM. Apple Support also highlights this requirement. If Dual SIM with eSIM isn’t working on your iPhone – Apple Support
Some older devices or very basic smartphone models also do not support eSIM technology at all. That is why checking compatibility before purchase is always recommended.
The Bottom Line
In most cases, you can absolutely use your usual SIM card and Planet eSIM at the same time. This gives you the freedom to travel while staying connected to the people and services that matter most back home.
By using your regular SIM for calls and your Planet eSIM for data, you avoid roaming fees, stay in control of your costs, and enjoy reliable internet wherever you go. It is one of the safest, smartest and most convenient ways to stay connected when travelling internationally.
