What Happens to Your Canadian Phone Plan When You Travel to the US

Cross the Canada-US border with your Rogers, Bell, or Telus plan active and your carrier starts a clock. Every day your phone connects to a US network costs you $16. You do not need to make a call or send a text. Your phone connecting to a tower is enough.

This is called Roam Like Home and it is the default behaviour on virtually every Canadian postpaid plan. Understanding exactly how it works -- and how to prevent it -- is one of the most valuable things a Canadian traveller can know.

What Triggers the $16/Day Charge

The daily fee fires on any outgoing activity on a US network. That includes sending a text, answering a call, or using any data. Incoming texts are free -- but the moment you reply, the charge triggers for that entire calendar day.

The daily period resets at midnight Eastern Time, not 24 hours after you first used your phone. If you land at 11:00 PM and reply to a text, you are charged for Day 1. Fifty-nine minutes later, Day 2 begins. Two charges in under an hour.

The fee covers unlimited usage for the rest of that calendar day once triggered -- calls, texts, and data all included until midnight ET. But it fires again the next day regardless of whether you use your phone at all, as long as your line is active and registered on a US network.

The $100 Cap -- And Why It Is Not the Protection It Sounds Like

Under the CRTC's Wireless Code, Canadian carriers cannot charge more than $100 per line per billing cycle for international roaming without your explicit consent. When you hit $100, your carrier is required to notify you and ask whether you want to continue.

In practice, most travellers say yes -- because they are in the middle of a trip and need their phone. The $100 cap becomes a checkpoint, not a ceiling. A 10-day US trip at $16/day runs $160 per person. Two people: $320. That is two checkpoints at $100 each, both agreed to without a second thought.

What Roaming Looks Like on a Longer Trip

A week in New York. A road trip from Vancouver to Seattle. A long weekend in Las Vegas. The math is the same in every case:

7 days x $16/day = $112 per person
10 days x $16/day = $160 per person
14 days x $16/day = $224 per person

These charges appear on your next monthly bill -- weeks after the trip, when the memory of the vacation has faded but the credit card statement has not.

The Two Settings That Prevent Roaming Charges Entirely

Before you cross the border or board a flight to the US, change two settings on your phone. Do both, in this order:

Step 1 -- Turn off Data Roaming: iPhone: Settings -> Cellular -> your carrier line -> Data Roaming off Android: Settings -> Connections -> Mobile Networks -> Data Roaming off

This prevents your phone from using data on foreign networks. It reduces the risk of accidental charges but does not eliminate it entirely -- your phone can still register on a US tower without data roaming enabled, which some carriers treat as sufficient to trigger the daily fee.

Step 2 -- Turn your Canadian line off completely: iPhone: Settings -> Cellular -> your carrier line -> Turn On This Line off Android: Settings -> Connections -> SIM card manager -> toggle your SIM off

With the line off, your phone cannot register on any network -- Canadian or foreign. No registration means no roaming trigger. This is the only step that provides a complete guarantee.

Both steps together are Cellulo's recommended approach before any US trip.

Airplane Mode Is Not the Answer

Airplane Mode turns everything off, including any travel eSIM you have installed for the trip. If you are using a travel eSIM for US connectivity, Airplane Mode will deactivate it.

The correct sequence when travelling with a travel eSIM:

Turn off Data Roaming on your Canadian line
Turn your Canadian line off completely
Use Airplane Mode on the flight as normal -- safe once the Canadian line is already off
Turn Airplane Mode off when you land -- your travel eSIM activates automatically

What About OTP Codes and Two-Factor Authentication

With your Canadian line off, text messages to your Canadian number will not come through. This affects OTP codes for banking apps, two-factor authentication, and any verification text.

The fix is simple: when you need an OTP, temporarily turn your Canadian line back on, wait for the text to arrive, then turn it off again immediately without making any outgoing calls or sending any texts. As long as you do not initiate any outgoing activity while the line is on and your phone is roaming, the $16 daily fee does not trigger.

The whole process takes about 30 seconds.

What Domestic Flights Have to Do With US Roaming

You do not need to cross the border for US roaming charges to appear on your bill. Several Canadian domestic flight routes pass over or near US airspace -- particularly flights from Toronto to Halifax, Moncton, Fredericton, or Charlottetown, which frequently track over northern Maine.

At cruising altitude, US cell towers can reach the aircraft. If your phone is active and connects to a US tower mid-flight on a domestic route, the $16 daily fee can trigger before you have left Canada.

The same two-step setting change -- data roaming off, then line off -- prevents this as well. Apply it before boarding any flight, not just cross-border trips.

The Alternative: A Travel eSIM

Turning your Canadian line off eliminates roaming charges. A travel eSIM gives you data connectivity to replace what your Canadian line would have provided.

A travel eSIM is a digital SIM that connects to local US networks -- T-Mobile and Verizon in the case of US plans on Cellulo -- independently of your Canadian carrier. It installs on your phone before you leave home, activates when you land, and covers all data usage for the duration of your plan without any daily fee.

With your Canadian line off and a travel eSIM active, you have full data connectivity in the US -- Google Maps, rideshare apps, messaging, browsing -- with no risk of a surprise roaming bill.

Browse US travel eSIM plans at cellulo.ca/travel/usa and set it up before your next trip south of the border.