You can somewhat bypass the lock screen on an iPhone running iOS 6. 1, but since most people have updated to much newer versions, this isn’t as relevant anymore. Doing so will give you access to the contacts, but that’s about it. Click here for details.
You need the Apple ID in order to activate the iPhone. There is no way to completely bypass this activation lock and use the phone without the original Apple ID. If you don’t have the Apple ID, you can adjust some network settings for a partial bypass to get some functionality, but you won’t be able to make calls without the Apple ID. See the next section for details on the partial bypass.
Even with this method, you will not be able to make or receive calls, or use iMessage.
Tap the Menu button to see all of the different options. While all of the options look like apps, they’re actually links to websites. Tap one of the categories to see the different options. Tap the Internet option to load a search engine or type in an address. The SMS option will show a variety of free SMS-sending services. You won’t be able to receive any SMS messages, but you can send them for free. Tap the Video option to load a variety of different video streaming services, including YouTube, Vimeo, Netflix, and Twitch.