According to Mumbai police statistics, the number of cyber cases abruptly rose from 142 in 2005 to 775 cases in 2008.
Credit card frauds, vulgar content, identity theft, hacking and lottery scams are among the other practices being used to cheat Mumbaikars.
"Cyber crime rate is rapidly increasing and more and more people are falling prey to various tactics applied by cyber frauds. There is a need to create more awareness among the people about such crimes," Joint Police Commissioner (Crime) Rakesh Maria said.
"Such crimes are likely to increase in future as there is a sense among offenders that they will not be caught," he added.
A total of 159 and 344 cyber crime cases were registered in the year 2006 and 2007 respectively.
Of the 775 cases in 2008, 164 were complaints pertaining to fake profiling, defamation and obscene content.
The police have already received 155 complaints of cyber crimes this year.
Of this 39 cases have been registered for allegedly hacking and tampering of source code.
"A few years ago, people had not taken such crimes seriously. Now they are complaining even for receiving obscene content. That is because of growing awareness among the people. In future the complaints may increase," said Naveen Chomal, legal officer of Mumbai police.
The police need to improve their skills in dealing with such crimes. Such crimes will increase in future as advanced technology coming in the market will be misused."