Motorola Mobility Holdings Inc posted a profit for the fourth quarter, but its shares fell almost 4 percent after it warned it would revert to a loss again in the current quarter, as it faces new competition from the Apple Inc iPhone.

In its first quarterly report as a separate company, Motorola said on Wednesday it had a profit of $80 million, or 27 cents per share compared with a loss of $204 million, or 69 cents per share in the year-ago quarter before it became a stand-alone company.

Revenue rose to $3.4 billion from $2.8 billion in the year ago quarter.

Motorola said it shipped 11.3 million phones in the quarter, including 4.9 million smartphones. The average estimate was for sales of 5.2 million smartphones and total shipments of 10.7 million, according to six analysts contacted by Reuters.

Its shares fell to $33.50 in late trade after closing at $34.83.

(Reporting by Sinead Carew; editing by Andre Grenon)