Dialer is a malicious computer program secretly installed on its victim's machine that tends to dial expensive international numbers or 900 numbers. Once installed, a dialer may change your computer modem settings in order to make these expensive calls without your permission. In most cases dialers may affect you directly if you are using dial-up modem. Dialer may also download pornographic content on your machine. Additionally, dialer may appear difficult to uninstall. Note, that the parasite may also come bundled with various shareware software products.

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