A well-known hacker claims to have overcome restrictions on Apple’s iPhone, allowing highly technical users to bypass AT&T Inc.’s network to use the phone’s Internet and music features.

In a post dated July 3 on his blog, Jon Johansen, 23, a prolific hacker of consumer electronics gadgets since he was a teenager in Norway, said “I’ve found a way to activate a brand new unactivated iPhone” without signing up for AT&T service.

“The iPhone does not have phone capability, but the iPod and Wi-Fi work. Stay tuned!” he wrote on his long-running blog, which is combatively named “So Sue Me.” The post was entitled “iPhone Independence Day,” a play on the July 4 U.S. holiday.

The site contained technical details for other hackers, as well as links to software necessary to complete the process.