What is the ruling on using a mobile phone during work?

The ruling on using a mobile phone during work varies depending on the nature of the work and its regulations. If its use harms the work, then it is prohibited, based on the hadith: "There should be no harm nor reciprocating harm." Likewise, if the work regulations prohibit it, then one must adhere to them, based on the hadith: "Muslims are bound by their conditions." However, if the regulations do not prohibit it, then it is permissible to use it, provided that it does not disrupt work performance.