If you are flying abroad with your family on AT&T, the first thing you will hear about is International Day Pass. It is simple and it works almost everywhere. But the daily fee is charged per line, so a family of four can run up a real bill on a 10-day trip. This guide does the math with the prices AT&T listed on October 4, 2026, for three trips American families take often: Japan, Italy and Mexico.
If you are heading to Japan, you can see what a data-only eSIM costs per traveler on our Japan eSIM page. For a whole family, the family eSIM page explains how one order covers everyone.
How AT&T International Day Pass works
International Day Pass (IDP) lets you use your domestic AT&T plan abroad: talk, text and data, in more than 210 destinations, according to AT&T. The key points, as listed by AT&T on October 4, 2026:
- $12 a day on land for the first line.
- $6 a day for each additional line on the same account used on the same calendar day.
- A charge is triggered when a line talks, texts or uses data in an included destination. Only one daily fee is charged per 24-hour period, even if you cross into several included countries that day.
- A cap: AT&T says you will never pay more than 10 daily fees per line, per bill period, for land or air travel. After that, the line keeps using IDP in included destinations at no extra daily charge for the rest of the bill cycle.
- Cruise ships are priced differently ($20 a day on AT&T's page), and are not covered by this guide.
Two details matter a lot for families. First, the cap counts per bill period, not per trip. A 10-day trip that straddles two billing cycles can be charged up to 10 days on the first bill and more on the next. Second, a line is only charged if it actually uses the cellular network abroad. A phone that stays on Wi-Fi with roaming turned off costs nothing.
AT&T international plan: is there anything cheaper than the Day Pass?
People searching for an "AT&T international plan" usually want a monthly travel package. As of October 4, 2026, International Day Pass is the option AT&T puts forward for travel abroad on land. We did not find a separate monthly travel package for new customers on att.com, so this guide uses International Day Pass for all calculations. If you hold an older or business plan, check its terms in your AT&T account.
Mexico and Canada are a different story
If your family is on an AT&T Unlimited plan, Mexico and Canada are already covered. AT&T states that Unlimited plans include unlimited talk and text within and between the U.S., Canada and Mexico, plus access to your plan data in Canada and Mexico, with no roaming charges. AT&T also notes that roaming may be at slower speeds and that data may be slowed when the network is busy.
For a family on AT&T Unlimited, a trip to Cancun or Toronto costs nothing extra. In that case, there is no reason to buy anything else, and we say so plainly.
What 10 days abroad costs a family with International Day Pass
Assumption: every line uses the phone abroad every day for 10 days, so each line is charged 10 daily fees. That is exactly the 10-fee cap, so the cap does not lower the bill on a 10-day trip that falls inside one bill period.
| Lines | Calculation | AT&T, 10 days in Japan or Italy |
|---|---|---|
| 1 line | 10 x $12 | $120 |
| 2 lines | (10 x $12) + (10 x $6) | $180 |
| 4 lines | (10 x $12) + 3 x (10 x $6) | $300 |
In Mexico, the same family on an AT&T Unlimited plan pays $0 in roaming. On a non-Unlimited plan, AT&T says the Roam North America feature may be available; we did not verify its price.
What the Day Pass gives you for that price is substantial: your own number, calls and texts, and the data from your domestic plan. If you need to call hotels, tour guides or family back home with your U.S. number, that is a real advantage.
Comparison with a data-only travel eSIM (Sirocco)
Sirocco is a travel eSIM for families. It provides mobile data only: no local phone number and no calls. Each traveler gets their own eSIM and their own plan, added next to the AT&T line without replacing it. Your number and WhatsApp stay the same.
Scenario used below: each traveler gets the cheapest Sirocco plan with at least 10 GB and at least 10 days (it can be a more generous plan). The 2-line and 4-line figures are the total for 2 or 4 of those eSIMs, with Sirocco's 10% group discount from 3 eSIMs in the same order already applied. Each traveler can then switch to a different plan, for example a smaller one for a child.
Sirocco bills in euros, and the Sirocco column below is shown in euros. To convert, the European Central Bank reference rate on October 2, 2026 was 1 EUR = 1.1225 USD; your card issuer's rate may differ.
| Destination | Lines | AT&T International Day Pass | Sirocco (EUR) |
|---|---|---|---|
| Japan | 1 | $120 | €16.40 |
| Japan | 2 | $180 | €32.80 |
| Japan | 4 | $300 | €59.04 |
| Italy | 1 | $120 | €11.60 |
| Italy | 2 | $180 | €23.20 |
| Italy | 4 | $300 | €41.76 |
| Mexico | 1 | $0 on AT&T Unlimited | €41.40 |
| Mexico | 2 | $0 on AT&T Unlimited | €82.80 |
| Mexico | 4 | $0 on AT&T Unlimited | €149.04 |
Sirocco prices are shown at today's rate and may change; the exact price is displayed before payment.
Compare the two columns, and keep in mind what each one includes:
- Japan and Italy: the Day Pass is charged per line and per day, and it includes calls and texts on your U.S. number plus the data from your domestic plan. A Sirocco eSIM is bought once per traveler, for a set amount of data and a set validity, with no calls.
- Mexico: if you are on AT&T Unlimited, Mexico is already included at no extra cost. Keep your AT&T plan.
- Mixed approach: some families keep the Day Pass on one parent's line (for calls) and give the other travelers a data eSIM. On AT&T, that parent line costs $120 for 10 days at the prices listed on October 4, 2026.
You can browse other destinations, such as Italy or Mexico, to compare per-traveler plans.
Practical tips before you fly
Turn data roaming off on your AT&T line
If you use a travel eSIM, set it up like this before you land:
- AT&T line: on, but data roaming off. You still receive calls and texts on your number. AT&T may still charge for calls you answer or texts you send abroad, so check your plan.
- Sirocco eSIM: selected for cellular data, with data roaming on.
- On iPhone, keep your AT&T line for iMessage and FaceTime so your contacts reach you as usual.
Step-by-step instructions are in how to turn on data roaming and keep your number while abroad.
Install the eSIM before you leave
Install every eSIM at home, on Wi-Fi, a day or two before departure. Sirocco sends each traveler their own install link by text or email, so a teenager can install theirs on their own phone.
Your child's phone
- Compatibility: dial *#06#. If an EID appears, the phone supports eSIM. More on the compatibility page.
- Smaller plan: children rarely need as much data as adults. A 5 GB plan is usually enough for maps, messages and a bit of video. Our data calculator helps you estimate.
- Child mode: with Sirocco, the child's screen shows no prices, there is no account in the child's name, and the parent manages everything. Details on the kids eSIM page.
- Top-ups: if one traveler runs out, you can top up just that eSIM without reinstalling it.
Check your own AT&T plan
Plans differ. Some include Mexico and Canada, some older plans have different travel terms. Log in to your AT&T account before departure and look at the international section of each line on your account.
Bottom line
For a family on AT&T, International Day Pass is the most convenient option: nothing to install, and your number works for calls. On a 10-day trip outside North America, it adds up to $300 for four lines at October 4, 2026 prices. In Mexico and Canada, AT&T Unlimited customers already have coverage and do not need to buy anything. Elsewhere, compare that total with a data-only eSIM per traveler in the table above, and consider keeping the Day Pass on one parent's line if you need calls.