Verizon said that its 4G network was cut for some customers on Wednesday after it experienced a connection problem.
“We have determined cause of 4G LTE issue & are working with major vendors to restore connections. Details as they come,” the company said via its Twitter account.
The tweet did not say how large the problem is or how many users are affected.
While it is being fixed, “ThunderBolts making voice calls, may get slower 1xRTT data,” an earlier tweet from Verizon stated.
According to PC Magazine, the company said that it sold more than 260,000 HTC Thunderbolt phones since late March, which is its first smartphone that uses the 4G network.