Three detained from Jaipur Central Jail for threatening to kill Rajasthan Deputy CM
The mobile phone from which the police control room allegedly received the threat was traced to the Jaipur Central Jail and recovered from the accused, police said. Read further on Dynamite News:

Jaipur: Rajasthan Deputy Chief Minister Prem Chand Bairwa allegedly received life threat following which three people were detained on Thursday from the Jaipur Central Jail, a police official said.
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The mobile phone from which the police control room allegedly received the threat was traced to the Jaipur Central Jail and recovered from the accused, police said.
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DGP Utkal Ranjan Sahoo said that due to "deficiency in the system at the lower level", mobile phones and SIM cards reach the jail.