You Never Left Canada. Your Carrier Charged You US Roaming Anyway.

You booked a domestic flight. You never crossed the border. But somewhere between takeoff and landing, your phone quietly connected to a US cell tower — and your carrier charged you a $16 roaming fee for a country you never visited.

This isn't a billing error. It's a known issue on several Canadian routes, and it catches thousands of Canadians off guard every year.

Why It Happens

Flight paths don't follow political borders. Several popular Canadian domestic routes pass over or near US airspace — and US cell towers are powerful enough to reach aircraft at cruising altitude. The routes most commonly affected:

• Toronto → Halifax, Moncton, Fredericton, or Charlottetown — the flight path frequently passes over northern Maine and the New Brunswick border area. This is the most commonly reported route for accidental US roaming in Canada.
• Toronto → Montreal — some routing clips US airspace over northern New York state.
• Flights along the BC coast and southern Ontario — proximity to US towers near Windsor, Niagara, and the BC lower mainland can trigger connections even on the ground or during taxi.

Your phone doesn't know it's on a plane. The moment it detects a stronger signal from a US tower than a Canadian one, it connects — and that connection is all your carrier needs to trigger a daily roaming charge.

What the Charge Actually Looks Like

For most Canadians on a Big Three plan — Rogers, Bell, or Telus — a US roaming connection triggers a daily roaming fee of approximately $16/day. The charge appears on your next bill as a single line item for international roaming, often with no indication it happened mid-flight on a domestic route.

Under the CRTC's Wireless Code, carriers cannot charge more than $100 per line per billing cycle for international roaming without your explicit consent. In the case of accidental in-flight roaming, the charge is typically just the one daily fee — $16 — since no data, calls, or texts were actually used. But that $16 adds up if it happens on every Toronto-Halifax flight you take.

How to Dispute It

If you've already been charged, the dispute case is strong. You were on a domestic flight, had no intention to roam, and likely made no calls, sent no texts, and used no data on the foreign network. Here's how to approach it:

Step 1 — Call your carrier directly. Explain that the charge occurred during a domestic flight and that you had no intention to use international roaming. Most carriers will waive a first-time accidental roaming charge without escalation, particularly if your account shows no actual data or call usage during the period.

Step 2 — Escalate to a supervisor if needed. Reference the CRTC's Wireless Code: carriers are required to notify customers when international roaming begins. If you were at 35,000 feet with no ability to respond to a notification, that notification requirement was effectively unmet.

Step 3 — File a complaint with the CCTS. If your carrier refuses to resolve the charge, the Commissioner for Complaints for Telecom-television Services (CCTS) handles disputes between Canadian consumers and their carriers at no cost. Accidental roaming on a domestic flight — with no actual foreign usage — is exactly the kind of complaint the CCTS exists to resolve. File at ccts-cprst.ca.

The Habit That Prevents This Entirely

Disputing a charge after the fact takes time. Preventing it takes five seconds. Here is Cellulo's recommended checklist for every departure — domestic or international.

Before you board:

1. Turn off Data Roaming on your Canadian line in Settings → Cellular
2. Turn your Canadian line off entirely — Data Roaming alone is not enough. Your phone can still register on a foreign network without data roaming enabled, which some carriers treat as sufficient to trigger the daily fee

On the plane:

3. Turn on Airplane Mode — airlines require it, and it is safe to do so because your Canadian line is already off. Airplane Mode will not affect your eSIM setup since you disabled the Canadian line before boarding

When you land:

4. Turn off Airplane Mode — your eSIM activates automatically and you are connected locally with no Canadian roaming charges possible
5. If travelling internationally, keep your Canadian line off for the duration of your trip. If this was a domestic flight, turn your Canadian line back on once you've landed in Canada.

Using a travel eSIM:

Your contacts can still reach you over data using WhatsApp, FaceTime, or iMessage — they work normally over your eSIM connection. Need an OTP or two-factor authentication code? Turn your Canadian line on briefly to receive the text, then turn it off again. Takes seconds.

Returning home:

6. Turn your Canadian line back on in Settings → Cellular and everything returns to normal

This checklist applies everywhere — not just on Maritime routes. Any flight, any border crossing, any international trip. Five seconds before boarding eliminates an entire category of surprise bills.

Travelling Internationally? Your Carrier's Roaming Fees Are Even More Expensive

The $16/day accidental charge on a domestic flight is frustrating. But if you're travelling internationally and leaving your Canadian line active, the costs compound quickly.

Canadian carriers charge $16/day for US roaming and the same rate in most international destinations. A 9-day trip to the US costs up to $288 per person. Two weeks in Europe runs over $220 per person — before you've agreed to pay more than the CRTC's $100/line cap.

The alternative is a travel eSIM from Cellulo. US eSIM plans start at $6 for 1GB over 7 days and go up to $49 for unlimited data over 10 days. For a 9-day US trip, two people pay $98 total on Cellulo versus up to $288 on carrier roaming — a saving of $190.

The eSIM installs before you leave home. Turn your Canadian line off before boarding, use Airplane Mode on the plane as normal, and when you land turn Airplane Mode off — your eSIM activates automatically. No daily fee, no roaming pass, no surprise bill. Browse US travel eSIM plans on Cellulo at cellulo.ca/travel/usa — and turn your Canadian line off before you board.