Hellphone

Hellphone is a 2007 French comedy horror film, directed by James Huth and stars JeanBaptiste Maunier, Jean Dujardin and douard Collin.

Back home, Sid asks his mother if he can have his birthday money in advance. She is only able to spareand Sid resolves to ask money from his boss at the fast food restaurant he works at.At his job, Sid asks his boss for his paycheck in advance but the boss refuses. Seeing aswill be the only money he is able to raise, Sid goes to a dinky shop run by Patrick Vo. After some haggling, Sid gets a cellphone, a sleek red phone with two protruding horns at the top. The phone comes to life in his hands, which astonishes the shopkeeper who has been trying to turn it on ever since he got it. He tries to take the phone back so he can sell it for more money, but Sid runs away. ........

Source: Wikipedia