This logo is the trademark of the service provider you see on the screen of your mobile phone, such as China Mobile or China Unicom. It has no substantive purpose, just telling you what service provider you are using.

Some ordinary mobile phones can be turned on and off, but they cannot be changed.

Smartphones can change their logos into personalized logos, such as Mars Mobile, Wife Mobile and China Mobile. According to your personal preference, just download a small software.

But when downloading software, be careful of rogue software and deduct your phone bill.