You land in Europe, your phone connects to a local tower, and by the time you check into your hotel you've racked up $200 in roaming charges. We've seen it happen more times than we can count. It takes five minutes to avoid.
The options
Carrier day-passes
Verizon TravelPass ($10/day), AT&T International Day Pass ($10/day), T-Mobile International Pass ($5–35 depending on plan).
Pro: your existing number and texts work.
eSIM / local SIM
Apps like Airalo, Holafly, or Nomad sell eSIM data plans ($5–40 for a week of data). Works on any unlocked phone made in the last 5 years.
Pro: way cheaper; your main number still receives calls over WiFi.
Verizon
Open My Verizon app.
Plans & Services → International Services.
Enable TravelPass — $10/day in most countries, auto-activates when you use data/calls abroad.
AT&T
Open myAT&T app.
My Plan → Add International.
Enable International Day Pass — $10/day, covers 210+ countries.
T-Mobile
If you're on an older plan, enable International Pass via the T-Mobile app before you go.
Using an eSIM instead
Download Airalo or Holafly before your trip.
Buy a data plan for your destination ($4–40 for 1–30 days).
Install the eSIM profile when prompted. iPhone: Settings → Cellular → Add Cellular Plan.
Leave your primary SIM active for iMessage/WhatsApp/FaceTime; use eSIM for data.
Turn OFF data roaming on your primary line so it doesn't burn a carrier plan.
Before you leave
Test that your phone is unlocked (needed for local/eSIM plans)
Download offline maps for your destination
Download WhatsApp or Signal — most business contacts abroad prefer these
Add trip airlines to your phone's wallet
Screenshot your passport, reservations, and driver\'s license
Common questions
Will iMessage work abroad?
Yes, over WiFi. Over cellular, it depends on your plan — free on T-Mobile Magenta, usually included in Verizon/AT&T day-pass, sometimes not on eSIM-only setups.
What about calls to US numbers?
Over WiFi with WhatsApp/FaceTime, free. Over cellular, check your plan — day-passes usually cover, eSIMs usually don't.
Does this work on cruise ships?
No. Ship cellular uses marine satellite and costs $5–12/minute. Buy the ship's WiFi package instead.