How to Use Wi-Fi Calling to Avoid International Fees

To use Wi-Fi calling and avoid international fees while traveling in the United States, you must enable the feature on your home SIM before departure and then use a secondary data connection, such as a Visit US Data eSIM, to provide the internet access required for the call. This setup allows your smartphone to route voice calls and SMS through your data plan rather than the expensive cellular roaming networks of your home carrier. By using a data-only eSIM, you can maintain your primary number for calls and texts without paying the daily roaming rates typically charged by providers like O2, Telstra, or Rogers.

Understanding Wi-Fi Calling with an eSIM

Wi-Fi calling is a technology that allows your smartphone to make and receive phone calls and text messages over an internet connection rather than a traditional cellular signal. While the name suggests you need a wireless router nearby, modern smartphones (iPhone 11 and later, and most recent Android devices) have a feature often called "Backup Calling" or "Wi-Fi Calling on Cellular Data." This allows the phone to treat the data provided by a secondary eSIM as a "Wi-Fi" source.

When you land in the US, your home carrier (like Telstra in Australia or O2 in the UK) will attempt to connect to local towers. If you leave your home SIM active but disable "Data Roaming" for that specific line, and instead use a Visit US Data eSIM for all cellular data, your phone can bridge the two. The home SIM sees the eSIM’s data connection and uses it to establish a secure link back to your home provider's server. To ensure your device is ready for this, you should check phone compatibility before your trip to confirm it supports dual-SIM functionality.

Why Avoid Traditional Roaming?

For travelers from the UK, Australia, and Europe, the cost of using a home SIM in the USA can be staggering. Carriers often charge a flat daily fee just for the privilege of using your existing plan abroad, or worse, they charge per minute and per megabyte.

Carrier	Typical Roaming Method	Potential Daily Cost
O2 (UK)	Travel Bolt On	High daily fixed fee
Telstra (AU)	International Day Pass	Significant daily charge
Rogers (CA)	Roam Like Home	Expensive daily flat rate
Visit US Data	Local eSIM	Zero roaming fees; prepaid data

By choosing to see plans for a local US eSIM, you bypass these daily fees entirely. Because Visit US Data plans are data-only and do not come with a local US phone number, they are designed to work in tandem with your existing number via Wi-Fi calling or through apps like WhatsApp, FaceTime, and Telegram.

Step-by-Step: Setting Up Wi-Fi Calling for Travel

To ensure you don't get hit with a surprise bill, follow these steps before you leave your home country.

On iPhone

1. Go to Settings > Phone > Wi-Fi Calling.
2. Toggle Wi-Fi Calling on This iPhone to ON.
3. Ensure "Add Wi-Fi Calling For Other Devices" is configured if needed, but the primary toggle is the most important.
4. Once in the US, go to Settings > Cellular.
5. Set your Visit US Data eSIM as the Cellular Data line.
6. Set your home SIM as the Default Voice Line.
7. Turn Data Roaming OFF for your home SIM to prevent accidental data charges.

On Android

1. Open the Phone app and tap the three dots (Settings).
2. Look for Wi-Fi Calling and toggle it ON. (On some models, this is under Settings > Connections > Mobile Networks).
3. In the US, go to Settings > Connections > SIM Card Manager.
4. Set the Visit US Data eSIM for Data and your home SIM for Calls/Messages.
5. Ensure "Data Switching" is handled correctly so the phone uses the eSIM data to power the home SIM's Wi-Fi calling feature.

For a more detailed walkthrough on getting your digital SIM active, you can read about how to set up your connection.

Choosing the Right Network for Your US Trip

The United States is vast, and coverage varies significantly between the bustling streets of Manhattan and the rugged terrain of the West. Visit US Data provides access to the two most reliable networks in the country: Verizon and AT&T, both offering extensive 5G coverage.

City Travel vs. Road Trips

If your itinerary involves a conference in a major hub, you will likely find excellent 5G speeds across both networks. For example, if you are looking for the Best Travel eSIM for Washington DC Tours, you will find that both Verizon and AT&T provide dense coverage that penetrates deep into government buildings and museums.

However, for those planning an American road trip, network choice becomes critical. Verizon is widely regarded as the leader for rural coverage. If you are heading to the mountains, you might want to compare T-Mobile vs Verizon: Cell Coverage in Montana to see why having access to a robust network matters when you are miles from the nearest town. A Visit US Data eSIM leveraging Verizon 5G ensures that even when you are off the beaten path, your phone has the best chance of maintaining the data connection required for Wi-Fi calling to work.

Data Needs and Plan Options

When using Wi-Fi calling, your voice calls use a small amount of data. However, your other activities—like navigation, social media, and streaming—will consume much more. Visit US Data offers a wide range of plans to suit different traveler needs:

• Light Users: 100MB, 500MB, or 1GB for short 7-day stays.
• Standard Tourists: 2GB, 3GB, or 5GB plans for 15 to 30 days.
• Power Users & Families: 10GB, 15GB, 20GB, 50GB, or even 100GB plans for longer stays or heavy data consumption.
• Daily Passes: Options ranging from 1GB per day up to 10GB per day for those who don't want to worry about limits.

If you run out of data in the middle of a trip through the Grand Canyon or during a busy week in Las Vegas, top-ups are available to keep your Wi-Fi calling active. Remember, these are data-only plans; they provide the "pipe" through which your home number communicates.

Arrival at the Airport

One of the biggest mistakes travelers make is waiting until they arrive at JFK, LAX, or O'Hare to figure out their connectivity. Airport Wi-Fi can be notoriously spotty and insecure. By installing your eSIM before you depart, you can activate it the moment your plane touches down. This allows you to call an Uber, check your hotel reservation, and immediately enable Wi-Fi calling so your family knows you've arrived safely—all without ever connecting to a public airport network.

Maximizing Your Data Usage

Since Wi-Fi calling relies on your data plan, it is wise to manage your usage effectively. High-bandwidth activities like streaming video can quickly deplete your allowance. If you plan on watching movies during a long domestic flight or a train ride between cities, it is better to download content ahead of time. You can learn more about managing these settings in our guide on Netflix Data Usage: How to Download for US Flights. Additionally, if you are an iPhone user, it is helpful to know how to check eSIM data usage on your iPhone so you can monitor how much data your Wi-Fi calls and apps are consuming in real-time.

Using WhatsApp and Other Apps

If your home carrier does not support Wi-Fi calling, or if you find the setup too complex, a Visit US Data eSIM still allows you to avoid international fees through data-based messaging apps. Since you will have a high-speed 5G connection from Verizon or AT&T, apps like WhatsApp, Skype, and Messenger will work perfectly. You can make crystal-clear voice and video calls using the data from your eSIM, completely bypassing the traditional cellular voice network. This is often the simplest solution for families traveling together who just need to stay in touch via group chats.

The bottom line

Using Wi-Fi calling powered by a Visit US Data eSIM is the most efficient way to keep your home phone number active while avoiding the predatory roaming fees of international carriers. By leveraging the 5G networks of Verizon and AT&T, you ensure high-quality voice calls and reliable data throughout your US adventure. Simply see plans that fit your duration and data needs, enable Wi-Fi calling before you fly, and enjoy the freedom of local connectivity from the moment you land.