Mobile phone engineering system

1. Samsung :  *#0*#

2. Sony : *#*#7378423#*#*

3. HTC : *#*#3424#*#*

4. LG : 3845#*(with your phone model)#

5. Huawei : *#*#2846579#*#*

6. Lenovo : ####1111#

7. Xiaomi : *#*#6484#*#*

8. Meizu : *#*#36446633#*#*

9. Vivo : *#558#

10. Oppo : *#36446337#