The iPhone in all its glory may be "all dat" but in reality and this would be expected, it does have a few bugs. Nothing's perfect. But the guys over at SPI Labs have issued a warning urging iPhone users not to use the internet call option in the phone. This feature essentially allows you to make a telephone call using the internet. SPI says that this feature could be misused as a bug in this feature cold probably trick a user into making calls to ‘900’ numbers that cost a lot of money and also keep track of calls made by the user over the net.