AT&T's wireless network covers most of North America. AT&T coverage is more sparse in Mexico, Canada, and rural areas of the U.S. When you roam off-network, you may encounter limits or restrictions on data usage. After a certain amount of data is used in an off-network area, you receive a text alert notifying you of the limit.
AT&T Roaming Policy
While you may receive a bill for roaming, your talk and text capabilities will not be blocked.
Customers with an AT&T unlimited plan can talk, text, and use their plan data when traveling in Mexico or Canada with no roaming charge. Travelers to other countries receive roaming charges unless they turn off data roaming on their phone's settings or if they sign up for an AT&T international calling and data plan.
AT&T offers a package called AT&T International Day Pass; $12 per day provides data, talk, and text access in over 210 destinations. There are also cruise packages available. AT&T Passport was retired in 2021, but subscribers with auto-renew turned on can keep those benefits. Prices, data allowances, eligible countries, fees, and other benefits vary from package to package.
With AT&T's GSM technology, AT&T says, "Your phone will assume the characteristics of the network where you are traveling. In other words, if you are in Italy, the phone will work like other Italian wireless phones."