The FCC has finally given a green light to Apple’s craved mobile phone and, as Apple declared yesterday after the Engadget scandal, we should be able to buy in late June.

Federal Communications Commission posted the approval announcement on their site yesterday, and Apple later admitted that their iPhone is on track of shipping in late June, as announced a month ago.

After registering a dazzling $4 billion drop in market value yesterday in only 6 minutes, due to an unverified e-mail posted on technology blog Engadget that hinted at a possible delay of the iPhone, Apple’s shares went up 2%, to $109.44 a share, immediately after the FCC approval.

“That’s the primary reason why the stock’s up today,” said Shaw Wu, an analyst with American Technology Research cited by The New York Times, adding that the certification was welcome news despite there being little doubt that the device would win approval.

The FCC was asked to keep some details about iPhone’s operational description confidential for 45 days, but the site’s posting did reveal the phone’s results in radio tests. However, no new details about Apple’s $500 gadget were emerged, just a simple confirmation that it will work with AT&T’s EDGE network (much inferior to the 3G network AT&T currently operates).