How to Use Your Phone Abroad Without a Huge Bill

Few travel surprises sting like a phone bill that’s bigger than your hotel bill. The good news is that roaming has become far more predictable. Most US carriers now sell flat daily passes, some plans include international data, and travel eSIMs let you buy local-style data from your couch before you leave.

The right choice depends on where you’re going, how long you’ll stay and how much data you use. This guide compares the 3 main options and shows you how to set up your phone before you board.

Start by checking your current plan

The FCC warns that for most US customers, domestic service plans don’t cover usage abroad, and roaming charges may not show up on your bill until the following billing cycle. So before anything else:

1. Log in to your carrier account and look for international or travel features on your plan.
2. Check your destination against your carrier’s list of included countries.
3. Look at what’s included: data, texts and calls are often treated differently.
4. Ask about usage alerts, so you get a text when you start incurring charges.

Some plans already include international data and texting in many countries. T-Mobile, for example, says several of its plans include data and texting in 215+ countries and destinations, with high-speed data caps that vary by plan and calls billed per minute. If your plan covers you, you may not need anything else.

Option 1: carrier day passes

A day pass lets you use your normal plan abroad for a flat daily fee. AT&T’s International Day Pass and Verizon’s TravelPass are the best-known examples.

How they work:

• The 24-hour clock starts on first use. AT&T says the day begins the first time you use data, send a text, or make or accept a call in an included destination. Verizon says background activity, such as app refreshes or email syncing, can also start a session.
• You pay only on days you use it. Days with no use generally aren’t charged.
• Pricing is flat but adds up. At the time of writing, both AT&T and Verizon list $12 per day in most included countries, with Verizon listing a lower rate for Mexico and Canada. AT&T caps land charges at 10 daily fees per line per bill period. Prices change, so confirm on your carrier’s site.
• Data limits may apply. Verizon, for example, includes a set amount of high-speed data per session, then slows speeds.

Day passes are the easiest option. Nothing to install, your number works normally and you can call and text as you do at home. They’re best for short trips or when you need your regular number all day.

Option 2: travel eSIMs

An eSIM is a digital SIM built into your phone. A travel eSIM is a data plan for another country or region that you buy online and install by scanning a QR code or through an app. Many popular travel eSIM providers sell plans by gigabyte and by number of days.

Apple says that to use another carrier while traveling, your iPhone can’t be locked to a carrier. On iPhone, go to Settings, General, About and look for “No SIM Restrictions” next to Carrier Lock. On Android, check your phone’s settings or ask your carrier. Apple also notes that recent iPhones can show travel eSIM options under Settings, Cellular, Add eSIM.

Why travelers like them:

• Often cheaper for data-heavy trips, especially longer stays.
• You keep your US number active on the other line for texts and calls, since most modern phones support dual SIM.
• Set up before you leave, so you have data the moment you land.

Tradeoffs:

• Usually data only. Many travel eSIMs don’t include a local phone number, so you rely on internet calling apps.
• Your phone must be unlocked and eSIM-compatible.
• Coverage quality varies by provider and partner network.

How to set up a travel eSIM

1. Confirm your phone is unlocked and supports eSIM.
2. Buy a plan for your destination from a reputable provider.
3. Install it at home on Wi-Fi, but don’t activate the plan until you arrive if the validity clock starts on activation.
4. In settings, label the lines clearly, such as “Primary” and “Travel.”
5. When you land, set the travel line for cellular data and turn data roaming on for that line only.
6. Leave your primary line on for calls and texts, with data roaming off.

Option 3: Wi-Fi Calling and Wi-Fi only

Wi-Fi is your best friend abroad. The FCC notes that using Wi-Fi won’t count toward your data allowance and that calling apps over free Wi-Fi can reduce voice roaming charges.

Wi-Fi Calling uses your regular phone number over Wi-Fi. AT&T, T-Mobile and Verizon all say Wi-Fi calls from abroad to US numbers come at no additional charge, while calls to non-US numbers are billed as international long distance. Some countries restrict Wi-Fi Calling, and if your Wi-Fi connection drops, the call drops too.

A few important cautions:

• Wi-Fi Calling can trigger a day pass on some carriers. AT&T, for example, advises turning off Wi-Fi Calling along with using airplane mode if you want to avoid the daily fee. Read your carrier’s rules.
• Toll-free numbers often don’t work from abroad. Save your bank’s and airline’s regular international contact numbers before you go.
• Public Wi-Fi isn’t always secure. Avoid logging in to banking or work accounts on open networks, and use your phone’s built-in protections. Passkeys make sign-ins safer on any network.

Day pass vs eSIM vs Wi-Fi: side-by-side

Key takeaway: For a short trip where you need your regular number, a day pass is the simplest choice. For longer or data-heavy trips on an unlocked phone, a travel eSIM usually costs less. Either way, Wi-Fi Calling handles most calls home.

Settings to change before you leave

These settings prevent most surprise charges:

• Turn off data roaming on any line you aren’t paying to use abroad. On iPhone, go to Settings, Cellular, Cellular Data Options. On Android, look in Settings, Network and internet or Connections.
• Turn off automatic app updates and backups over cellular. The FCC notes that some apps download data automatically, which can cause roaming charges.
• Download maps, playlists and shows while on Wi-Fi. Offline maps are a lifesaver on arrival.
• Back up your phone before the trip in case it’s lost or stolen. See our guide on how to back up your phone.
• Pack a charger and adapter, and check our tips on why your phone battery drains fast, since navigation and roaming use a lot of power.
• Save emergency numbers for your destination and the nearest US embassy or consulate.

Your step-by-step travel phone plan

1. 2 weeks before: Check your plan’s international coverage and your destination list.
2. 1 week before: Decide between included roaming, a day pass or a travel eSIM. If using an eSIM, confirm your phone is unlocked and install the plan.
3. 3 days before: Download offline maps, entertainment and boarding passes. Turn on usage alerts.
4. Day of departure: Set data roaming correctly for each line. Turn on Wi-Fi Calling if your carrier allows it without triggering charges.
5. On arrival: Activate your travel eSIM or confirm your day pass started. Check your carrier app for a confirmation text.
6. After you return: Turn data roaming off, remove or disable the travel eSIM and check your next 2 bills.

Need help building an itinerary? Our guide on how to use AI chatbots for everyday tasks shows how to plan a trip with AI and double-check the details.

Conclusion

Using your phone abroad doesn’t have to be expensive. Check what your plan already covers, choose a day pass for convenience or a travel eSIM for value, lean on Wi-Fi Calling for calls home and lock down your data roaming settings before you leave. 10 minutes of setup can save you from a bill you’ll remember longer than the trip.

Sources

• FCC: International Roaming: Mobile Phone Use Abroad — plan coverage, delayed billing, Wi-Fi and automatic downloads
• AT&T: International Day Pass details — how the 24-hour pass starts, pricing and the 10-day cap
• Verizon: TravelPass FAQs — daily pricing, session start and data limits
• T-Mobile: International roaming services — included roaming in 215+ countries and destinations
• Apple Support: Use eSIM while traveling internationally — unlocked phone requirement and travel eSIM setup
• AT&T: International Wi-Fi calls — Wi-Fi calls to US numbers and international long distance billing