A common concern when using a travel eSIM is losing access to your phone number. The solution is simple: keep your home SIM installed and use dual SIM mode. Your phone number remains fully active for calls and texts while the travel eSIM handles all data.
This guide covers the setup and the options for managing incoming calls to avoid roaming charges on your home carrier.
Step-by-step instructions
- 1
Keep your home SIM installed
Leave your physical SIM card in your phone or keep your home carrier's eSIM profile active. With dual SIM, your phone maintains two active lines simultaneously. Your home number stays reachable for incoming calls and SMS.
If your phone is eSIM-only (like U.S. iPhone 14+), keep both the home eSIM and travel eSIM installed and active.
Tip: Do not remove your home SIM before travel. Simply add the travel eSIM as a second line.
- 2
Set the travel eSIM as your data line
On iPhone, go to Settings > Cellular > Cellular Data and select the travel eSIM. On Android, go to Settings > Network & internet > SIMs and set the travel eSIM for mobile data. Your home SIM continues handling calls and texts.
All internet traffic (apps, browsing, streaming) goes through the travel eSIM at local data rates instead of your home carrier's roaming rates.
Tip: Turn off 'Allow Cellular Data Switching' on iPhone to prevent data from ever falling back to your home SIM's roaming connection.
- 3
Set up call forwarding to avoid roaming fees
If your home carrier charges for receiving calls while abroad, forward calls to voicemail before departing. Dial your carrier's forwarding code (for example, *72 for T-Mobile, *73 to cancel) or set it up through your carrier's app. Voicemail messages are typically free or low-cost to retrieve once you connect to Wi-Fi or the travel eSIM's data.
Most European carriers include incoming calls at no extra charge under EU roaming regulations, so forwarding is often unnecessary if you are traveling within the EU.
Tip: Test the forwarding code before you leave. Call your own number from another phone to confirm it goes to voicemail instead of ringing through.
- 4
Enable Wi-Fi Calling to route calls over eSIM data
Wi-Fi Calling lets your home number receive calls over any data connection, not just actual Wi-Fi. On iPhone, go to Settings > Phone > Wi-Fi Calling and toggle it on for your home SIM. On Android, go to Settings > Network & internet > SIMs, select your home SIM, and turn on Wi-Fi Calling.
With this enabled, incoming calls to your home number ring over the travel eSIM's data connection instead of through carrier roaming. Support varies by carrier: T-Mobile supports Wi-Fi Calling globally, while AT&T applies geographic restrictions in some countries.
Tip: Check your carrier's Wi-Fi Calling coverage before you travel. Not every carrier supports it in every destination.
- 5
Confirm messaging apps stay connected
Apps like WhatsApp, iMessage, and Telegram send and receive messages over data, not through your carrier's SMS network. Once your travel eSIM is active for data, these apps keep working under your existing account and phone number with no extra setup. Standard SMS text messages still route through your home SIM, so keep that line active if you need to receive one-time SMS verification codes.
Frequently asked questions
Will people see my same phone number when I use a travel eSIM?
Yes. Your phone number is tied to your home SIM, not to the travel eSIM. Outgoing calls placed from your home SIM line show your normal number. Outgoing calls placed from the travel eSIM line show a different number or no number (if the eSIM is data-only). Set your home SIM as the default for calls in Settings > Cellular > Default Voice Line.
Can I receive SMS verification codes with my home SIM while abroad?
Yes. SMS delivery works through your home carrier's network independently of the travel eSIM. As long as your home SIM is active and has network registration in the destination country, SMS codes arrive normally. Some carriers include free incoming SMS while abroad. Others charge per-message rates. Check your carrier's international roaming policy.
What if I want to use only the eSIM and not keep my home SIM?
You can remove your home SIM or turn off that line. Your phone number becomes unreachable for regular calls and texts. However, apps like WhatsApp, iMessage, and Telegram continue working over the eSIM's data because they use internet-based messaging, not traditional SMS.
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