IT security firm Sophos has warned internet users that they should not be swayed away by e-mails offering iPhone 4G for free.

Sophos said spammers are using the bait of free iPhone 4G to get access to users email addresses as well as other personal information.

As per the IT security firm, spammers invite internet users to sign up to try and keep the next generation iPhone. The firm also exposed a campaign on Twitter that uses avatars of sexy young women, who pump out messages to users offering free iPhone 4G.

When a recipient clicks on a link, he gets into a website that demands personal information such as name, address, date of birth and contact number.

Commenting on the topic, Graham Cluley from Sophos said, "Clicking on any of these links takes you to a webpage that asks you to fill in a form with your personal data."

Sophos recommended that users should take such offers as too-good-to-be-true.