If you do not want Rick Astley as a background should be possible to go for if you install OpenSSH, a program to use the SSH protocol on the Iphone.
Sophons security company said that a worm has begun spreading among Australian iPhone users who jailbreak their phone and also install SSH without changing the default password. The worm does not cause any real harm but to get the background image replaced by a picture on the singer Rick Astley can be quite annoying.
A phone hit by the worm tries according to Sophos find other iPhone that is connected to the same mobile network, which has the same security holes.
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