Apple is working on a security patch for the iPhone to fix a vulnerability that could be exploited by cybercriminals.
The vulnerability in the way iPhones handle text messages was demonstrated by independent security adviser Charlie Miller at the SyScan security conference in Singapore yesterday.
Miller demonstrated that he could use the vulnerability to temporarily disconnect an iPhone from the network, but did not give a detailed description of the attack method.
He has agreed with Apple to keep the details under wraps until the Black Hat security conference in Las Vegas on 25-30 July.
Apple has until then to fix the vulnerability, which Miller warned could potentially be exploited to execute code on an iPhone remotely.
If successful, criminals could potentially run code to monitor the location of the phone using GPS, turn on the phone's microphone to eavesdrop, and add the phone to a botnet, according to Miller.
Miller, who has still to determine if this kind of attack can be carried out, has said in media interviews that the vulnerability could be "really serious" and that Apple is investigating.
Apple did not respond to requests for information about the iPhone vulnerability.