How to install and use dual SIM on SmartLess Mobile
Most newer phones that support eSIM also support dual SIM. That means with SmartLess Mobile, you can use two numbers on one phone. For example, you can have one personal line and one work line on your phone, or use separate lines for voice and data.
This article explains how to install your SIM cards and configure dual SIM settings on your iPhone or Android device.
Before you begin
Please remove any old and inactive eSIMs that you’re no longer using from your phone.
Inactive or leftover SIMs/eSIMs can interfere with network registration and may prevent your SmartLess Mobile service from working correctly. This most commonly happens when moving from one provider to another, and both the old and new SIMs/eSIMs are still installed in the phone.
If you need help removing a SIM card, follow our step-by-step guide: SIM card
If you need help removing an eSIM profile, follow this guide: eSIM
To ensure your device is fully compatible with SmartLess Mobile, check your phone using our Device compatibility checker.
How dual SIM works
When using multiple SIMs:
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You can make and receive calls and texts from either number
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You choose which SIM/eSIM is used for mobile data
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You can assign a default line for calls, texts, and data
- You can change your default settings at any time
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Each line can be labeled (for example: Personal or work)
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Most newer eSIM-capable phones can store more than two numbers, but only two numbers can be active together at the same time
Activate your service first
Before installing your SIM or eSIM, make sure your SmartLess Mobile plan is activated.
For step-by-step activation instructions:
iPhone dual SIM setup
Dual SIM is supported on iPhone XS/XR and newer models running iOS 12.1 or later.
Once your SmartLess Mobile plan is active, use the following guides to install your SIM or eSIM:
Label your lines
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Go to Settings
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Tap Cellular
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Tap each line
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Assign a label (for example: Personal or work)
Labels help you select the correct number when calling or texting.
Choose default lines
You can decide which number your iPhone uses by default for calls, messages, and data. These settings can be changed at any time.
Calls and SMS
This determines which number your iPhone uses when placing a call or sending an SMS/MMS message.
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Go to Settings
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Tap Cellular
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Select Default Voice Line
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Choose the line you want as default
Note: Most phones will allow you to change the number you’re using to call or text in the dialer or the messaging app.
Mobile Data
This controls which SIM provides your cellular data connection.
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Go to Settings
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Tap Cellular
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Tap Cellular Data
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Select the line you want to use for data
Allow cellular data switching (Optional)
When enabled, your iPhone can temporarily use the other line for data if the primary data line loses service.
To toggle:
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Go to Settings
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Tap Cellular
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Tap Cellular Data
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Select Allow Cellular Data Switching
Tip: If one plan has limited data and the other is unlimited, make sure the unlimited plan is selected here.
iMessage & FaceTime
iMessage and FaceTime can send and receive using either phone number or your Apple ID email.
iMessage
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Go to Settings
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Tap Messages
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Select Send & Receive
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Choose the phone number(s) and/or email address you want to use
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Select which number starts new conversations
FaceTime
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Go to Settings
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Tap FaceTime
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Select the phone number(s) and/or email address you want to use
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Choose your default Caller ID
You can change all the settings above at any time.
Android dual SIM setup
Dual SIM settings may vary slightly depending on your device manufacturer, but the setup process is similar.
Once your SmartLess Mobile plan is active, use the following guides to install your SIM or eSIM:
Label your SIMs
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Open Settings
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Select Network & Internet or Connections
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Tap SIMs
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Select each line
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Assign a label (look for the Edit icon, usually in the upper-right corner)
Choose default settings
Within the SIM settings menu, you can set the primary SIM for calls, texts, and mobile data.
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Open Settings
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Select Network & Internet or Connections
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Select SIMs
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Look for Your primary SIMs
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Tap each option to set the default
Some Android devices also allow you to select the SIM directly from the dialer or messaging app before placing a call.
RCS and Google Messages
RCS messages can be sent with either number, and can be managed in Google Messages Settings. To learn more, see our RCS article
Google Messages
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Go to Messages settings
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Tap General
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Tap RCS chats
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Check the number(s) you want to use