Out there there are spy applications that are capable of seeing all your activity on your cell phone, WhatsApp messages, Tinder, Facebook, listen to you through the microphone of your cell phone, activate your camera and take photos, videos, etc. If someone has accessed your phone and installed an app of this type, they could be viewing all this information remotely in real time. However, even if you have been careful that someone has done this to you (ex. Your partner or ex), the things you have or do on your cell phone can still be spied on by people on the other side of the world, who may be You gave them permission to do so, although you may not have realized it..
Software developers and cell phone manufacturers want your data
How to know if your WhatsApp is spied on, cloned, hacked or intervened
How to know if an APP activates the camera or microphone of the cell phone
Can a NEW cell phone come with a virus?