What is the ruling on the prayer of one who carries a mobile phone headset, which is likely to have pre-seminal fluid on it or on part of it, during prayer?

Impurity does not transfer if the madhi (pre-seminal fluid) is dry and the phone earpiece is dry. However, if the madhi or the earpiece is wet, then the impurity transfers, and the earpiece must be purified by pouring water over it until it is submerged. Wiping the earpiece with a wet tissue does not purify it. Prayer performed with impurity due to ignorance or forgetfulness is valid. The questioner is advised to disregard obsessive thoughts.