OPPO mobile phone card installation methods and steps: tools\/raw materials: OPPO mobile phone one (here OPPOR11 as an example, other models are similar) 1, first, from the mobile phone packaging box to find the card needle, and then insert the card needle into the small hole next to the phone, take out the card. 3. Then break the sim card apart and get the smallest sim card. 4, then align the sim card with the card slot, and then put the sim card into the card. 5, finally put the Cato back to the phone, the phone card can be installed successfully.