US tourists face roaming issues in Greece and other European countries

Many travelers from the United States in Greece and other countries this week lost a crucial tool to check maps, make reservations, use ride-hailing apps and more because of a cellular data outage that began affecting users of AT&T, T-Mobile and Verizon on Wednesday.

The affected travelers, mostly in Europe, posted on social media, seeking answers about what caused the outage and how long it would last.

Some reported being unable to make phone calls, send texts or use online services without Wi-Fi for as long as 24 hours.

It is unclear what caused the outage, which appeared to extend from Britain to Turkey.

An AT&T spokesperson said that the carrier's network was operating normally, but that some customers traveling internationally might be experiencing service disruptions because of an issue outside the AT&T network.

The company said it was...