What was the first 4G LTE phone?

The first 4G LTE phone was the HTC ThunderBolt, which was released in March 2011. It was launched by Verizon Wireless and marked a significant advancement in mobile technology, offering faster data speeds and improved connectivity compared to previous generations. The ThunderBolt featured a 4.3-inch display and ran on Android, paving the way for the proliferation of 4G smartphones in the market.