How to use two SIMs while travelling abroad
Two active lines let you keep a home number while using a travel plan for data. The important choice is which line handles each task.
Can a phone use two SIMs at once?
Many recent iPhones and Android phones support a home line alongside a travel eSIM, but the exact combination depends on the model, region and carrier. Apple says supported iPhones can use a physical SIM plus eSIM, and newer supported models can use two eSIMs. Google says supported Pixels can choose separate SIMs for calls, messages and data. Check your specific device and whether it is unlocked before you buy. Sources: Apple Dual SIM and Google Pixel Dual SIM.
Two lines do not mean two independent internet connections working together. A phone normally selects one line for mobile data at a time. Calls and SMS can stay on the home number while the travel line supplies data, if the phone and carrier support that arrangement. A travel eSIM is often data only, so it may not provide a new voice number or conventional SMS service.
Set the three preferences before you need them
Give the lines clear labels such as Home and Travel. Set the travel line as the cellular-data line after its plan is ready. Choose your preferred line for calls and messages, and check how an individual contact or app may override that preference. On iPhone, the settings are under Cellular or Mobile Data; on Pixel, they are under Network & internet → SIMs. Menu wording changes by software version.
| Task | Check on the phone | Check with the provider |
|---|---|---|
| Browsing and maps | Travel line selected for mobile data; a page loads with Wi-Fi off | Destination, activation and roaming instructions for that plan |
| Calls | Default voice line and any contact-specific line | Home carrier's incoming and outgoing roaming rates |
| Bank or booking SMS | Home line remains active if you need its number | Whether receiving SMS abroad is supported or charged |
How do you avoid unwanted home-line data use?
Keep the home line available only for functions you need. Review any “allow cellular data switching” or automatic data-switch setting, because a phone can fall back to the home line if the travel line has poor service. If avoiding home-data roaming is the goal, turn off data roaming for the home line and verify that the travel line is selected for data. Do not blindly turn off roaming on both lines: some travel eSIMs use partner networks and require data roaming on their own line. Read the travel provider's setup instructions.
Keeping the home line active does not make it free. A voice call, SMS, carrier voicemail, or other home-plan feature may trigger roaming charges even when the travel eSIM carries data. Apple explicitly warns that a home eSIM kept on alongside a travel eSIM may still incur roaming fees. Ask your home carrier for its current terms; do not assume the phone settings alone control billing.
Test the arrangement on arrival
Disable Wi-Fi for a brief test, open a web page, and check the data-use display for the travel line. Then send a message through the service you expect to use. If you need your home number for a verification code, test that separately. Avoid deleting an eSIM to solve a setting problem; many activation codes cannot simply be reused. Our troubleshooting guide follows the checks in an order that preserves the installed profile.
When you return home, select your home line for mobile data again and turn off the travel line if it is no longer needed. Keep a note of which line is assigned to data before and after the trip. For a fuller predeparture sequence, use the phone preparation guide. If your main concern is keeping your number, the number guide explains the calls and texts separately.