Cellphone users reported outages across several major carriers on Monday evening, according to reports cited by AZ Family. Customers said they were experiencing service problems affecting mobile connections on more than one network.

The outage reports involved major providers including T-Mobile, Verizon, AT&T and Boost Mobile. Downdetector, a site that tracks user-submitted service issues, received thousands of reports as the problems spread during the evening.

Because the available information is limited, it is not yet clear what caused the disruptions or how widely each carrier was affected. The reports suggest that customers on multiple networks were dealing with similar service issues at the same time.

The incident quickly drew attention online as users checked whether the problems were isolated to one provider or part of a broader cellphone outage. Further details from the carriers were not included in the available report.