The interest of 6000 mobile phone 12 is 300 yuan. According to the relevant public information, if you choose to pay by installment, then you need to pay the interest fee of the loan. Take the annual interest rate of 6% as an example. If you choose to divide the 6000 yuan mobile phone into 12 installments, the monthly repayment amount is (6000+6000 * 6%/12)/12 = 525 yuan. In this case, the total interest is: 525* 12-6000=300 yuan.