There were questions about the speed of Verizon's network because of the potential increase in customers, but the company said it has been getting ready. In California alone, Verizon spent $700 million preparing their network for the launch, according to Verizon.
Several people camped outside early in the morning to save their spots in line at a store in Burbank. Verizon stores in Southern California open at 7 a.m.
"Since we've been waiting so long, we wanted to come down and get it right away," said one customer at the front of the line.
Some Verizon customers, like Andre Munoz, were able to order their iPhone 4 online during the pre-sale. He said he was standing in line to get his wife one just like it.
Chris Devine said he had been a Verizon customer for seven to eight years, and he knew this day would come.
"I've been waiting for the iPhone for a very long time," he said.
Gizmodo features editor Joe Brown said Verizon's iPhone is more reliable.
"It's more robust technology; it's got stronger encryption," he said.
It also has the ability to work as a wireless Internet replacement.
On the other hand, AT&T's version can be used internationally, and it allows simultaneous transmission of data and voice, Brown said.
It is unclear if there will be antenna problems like there were with AT&T's iPhone 4. Apple had to give out special cases to deal with the antenna problems.
Technology site iLounge reports similar problems with the Verizon version, but Apple would not confirm or deny the report.
The 16 GB version goes on sale for $199 and the 32 GB version goes on sale for $299.