According to a report by TechnoBuffalo Apple and Verizon were very careful to make sure that the iPhone 4 launch stayed under wraps until the announcement. A source close to the process claims the device was codenamed Acme and employees were privy to information only on a need-to-know basis. Some were testing Verizon connectivity at Apple stores up to six months in advance of the February release.
Some Verizon employees received iPhone 4 units two weeks prior to the official launch. This privilege required the signing of a four-page non-disclosure agreement (NDA) from Apple before they could get their hands on the device. The CDMA iPhone 4 itself had unique security features to ensure that a device wouldn't go missing as happened in 2010 with a prototype GSM iPhone 4.