If you are using a Vivo phone, it is recommended to use the original protective case and protective film to protect the device, our family's protective case and film are rigorously tested; you can also go to Settings - System Management/My Device - Customer Service - Electronic Warranty Card - view the operating instructions and warranty terms - Maintenance and Maintenance, to understand some of the laws of maintenance, the customer service center is more intimate maintenance services.
(Some models need to go to Settings - More Settings - Manuals/Instructions - Cell Phone Maintenance and Care to understand.)
Safe way to use the device:
1, in order to prevent hearing damage, please do not use high volume to listen to the sound for a long time;
2, the working environment temperature between 0 ℃ - 35 ℃, storage environment temperature between -20 ℃ - 45 ℃. Too high or too low temperature will affect the use of the device, and even cause damage to the device and battery;
3, when using the device as far away as possible from ordinary telephones, TV, radio and office automation equipment in order to avoid interference from wireless devices, affecting the use of the effect;
4, when using the device, please and the implantation of medical equipment (such as pacemaker, cochlear implantation, etc.) to maintain a minimum of 16cm Customer Service Center?
7. Please do not place the device, battery, charger in and around heating devices (such as microwave ovens, ovens, etc.) to avoid circuit damage, fire or other accidents.
For more doubts, you can enter the official website of Vivo - My - Online Customer Service - enter manual, consult the online customer service feedback.