[AC Question]

Whenever I unlock my LG 90L cell phone, the browser opens and ads pop up.

[Rukbat]

Install AdWare, Avast Mobile Security & Antivirus and Malwarebytes Anti-Malware. Before you go to sleep, run one of them. When it's finished (it may be by the time you wake up), let it quarantine or delete anything it finds. Run the other one the next night. Same thing for what it finds. Same thing for the third one.

It sounds as if you have some malware, virus, trojan or adware.