How do I set up Dual SIM with my Travel eSIM?

What is Dual SIM?

Dual SIM allows your phone to have two mobile services available at the same time.

Depending on your phone, this may be:

• One physical SIM and one eSIM.
• Two eSIMs.
• Two physical SIMs.
• A combination of several stored eSIMs, with two lines active at once.

The exact capabilities vary by phone model and region.

Can I use my normal SIM and ZenSim travel eSIM together?

Yes. Many modern smartphones support using your normal SIM and a ZenSim travel eSIM at the same time.

A common travel setup is:

• Mobile data: ZenSim travel eSIM
• Default voice line: Your normal primary SIM
• Default messaging line: Your normal primary SIM

This allows you to use ZenSim for travel data while keeping your usual phone number available.

Can I keep my normal phone number active?

Yes. Keeping your normal SIM switched on allows your usual number to remain available for calls, text messages, banking verification codes, and other services.

However, your normal provider's international roaming charges may still apply.

Can I receive SMS verification codes overseas?

In many cases, yes. Your primary SIM must remain active and connected to a roaming network.

Your mobile provider controls whether your number can receive messages overseas. Check its roaming arrangements before travelling, particularly if you rely on SMS for banking or account verification.

Does a ZenSim travel eSIM replace my normal phone number?

No. A travel eSIM is generally used for mobile data and does not replace the phone number attached to your normal mobile service. Additionally, our travel eSIMs do not come with a number at all.

You can keep your primary SIM active for calls and messages while using ZenSim for data.

Can I make normal phone calls using the travel eSIM?

All ZenSim travel plans are intended for mobile data. Traditional mobile calls and SMS are not included.

You can still use internet-based calling and messaging services such as WhatsApp, FaceTime, Messenger, Signal, or similar apps through your ZenSim data connection.

Which SIM should I select for mobile data?

Select the ZenSim travel eSIM as your mobile data line while overseas.

The wording differs between phones, but the setting may appear as:

• Mobile Data
• Cellular Data
• Preferred SIM for Data
• Default SIM for Internet

Which SIM should I select for calls and messages?

You can leave your normal primary SIM selected as the default line for voice calls and messages if you want to keep using your usual number.

Be aware that making or receiving calls through your primary provider may result in roaming charges.

Should data roaming be turned on?

Data roaming should normally be:

• Turned on for the ZenSim travel eSIM.
• Turned off for your normal primary SIM.

Travel eSIMs connect to partner networks while overseas, so data roaming needs to be enabled for the ZenSim line.

Will turning on data roaming cause charges on my normal SIM?

Data roaming is controlled separately for each SIM on most compatible phones.

Make sure you are changing the setting for the ZenSim eSIM and not your primary SIM. Leaving data roaming enabled on your normal SIM could result in charges from your usual provider.

What is mobile data switching?

Mobile data switching allows your phone to temporarily use data from another SIM if the selected data line has a weak or unavailable connection.

To reduce the risk of your primary SIM using expensive roaming data, we recommend turning off settings such as:

• Allow Mobile Data Switching
• Cellular Data Switching
• Switch Mobile Data Automatically
• Backup Calling Data

The exact wording depends on the phone.

Can I still be charged roaming fees if mobile data is set to ZenSim?

Yes. Setting ZenSim as your mobile data line helps prevent data roaming charges on your primary SIM, but other charges may still occur.

Your primary provider may charge for:

• Making calls.
• Receiving calls.
• Sending SMS or MMS.
• A daily roaming fee for keeping the service on while overseas.
• Accessing voicemail.
• Call forwarding.
• Wi-Fi Calling in some circumstances.
• Background data if data switching is enabled.

Check your provider's international roaming rates before departure.

Is receiving an SMS overseas free?

Many Australian providers do not charge for receiving a standard SMS while roaming, but this is controlled by your primary mobile provider.

Sending an SMS, receiving an MMS, making calls, receiving calls, or accessing voicemail may incur charges.

Can voicemail create roaming charges?

Yes. Depending on your provider, unanswered calls that divert to voicemail may result in roaming or call-forwarding charges.

Consider reviewing your voicemail and call-diversion settings before travelling.

Should I disable international roaming with my normal provider?

You may choose to disable roaming completely on your primary service if you do not need calls or text messages overseas.

However, doing this may also prevent you from receiving SMS verification codes. Contact your primary provider to understand what will remain available.

Can I turn my primary SIM off completely?

Yes. Turning off your primary SIM can provide additional protection against roaming charges.

However, you will not receive calls, messages, or verification codes on your normal number while it is switched off.

Can I use Wi-Fi Calling with my normal number?

Some phones and providers allow calls and messages over Wi-Fi while overseas. Availability, behaviour, and charges vary between providers.

Confirm how overseas Wi-Fi Calling is billed by your normal mobile provider before relying on it.

How do I know which SIM is being used?

Your phone usually shows the selected SIM or line beside calls, messages, and mobile data settings.

We recommend giving each SIM a clear label, such as:

• Primary
• Australia
• Personal
• ZenSim
• Travel Data

This makes it easier to select the correct service.

Can my phone have several eSIMs installed?

Many phones can store multiple eSIM profiles, although only a limited number can be active at the same time.

The exact number varies by device model. Keeping old or unused eSIMs installed may make your phone's mobile settings more difficult to manage.

Does my phone support Dual SIM?

Most recent Apple, Samsung, Google Pixel, and other premium smartphones support some form of Dual SIM or eSIM functionality.

However, support varies by model, country of purchase, and carrier. Some phones sold in particular regions may not support eSIM even when similarly named models do.

Check your exact model before purchasing.