Thousands of AT&T's cellular customers were left without service Thursday because of a massive reported outage across the U.S., leaving them unable to place calls, send texts or access the internet. Downdetector, which tracks online outage reports submitted by users, showed more than 64,000 customers have reported issues, as of 8:30 a.m. Eastern. The outages began at approximately 3:30 a.m. ET. The carrier has more than 240 million subscribers, the country's largest. “Some of our customers are experiencing wireless service interruptions this morning. We are working urgently to restore service to them. We encourage the use of Wi-Fi calling until service is restored,” AT&T said in a statement. Cricket Wireless had more than 13,000, the outage tracking website said Thursday. Verizon had more than 4,000 outages and T-Mobile had more than 1,900 outages. Boost Mobile had about 700 outages. Verizon and T-Mobile both said in their statements they didn't experience outages. “Verizon’s network is operating normally. Some customers experienced issues this morning when calling or texting with customers served by another carrier. We are continuing to monitor the situation,” Verizon said. Read more: https://www.9news.com/article/news/nation-world/att-hit-with-massive-outage/507-2b35f093-be53-4a92-a23d-dfa98e9393e3