A user reports that their smartphone is exhibiting unexpected application behavior, high network traffic, and received a data usage limit notification despite normal use. The user also mentions installing an application recently from a source outside the official app store to get premium features for free. As a technician, what is the most likely cause of these symptoms?
The symptoms are due to a legitimate software update from the smartphone's official vendor.
These are typical behaviors for a smartphone approaching the end of its service life.
The device has potentially been compromised due to jailbreaking or root access to install unauthorized applications.
The smartphone's data usage notification settings were mistakenly configured to alert at lower thresholds.
When a user installs applications from unofficial sources, especially to access premium features without payment, it may require the device to have root access or be jailbroken to bypass security measures. This can lead to the installation of applications that can exploit the device, causing high data usage, high network traffic, and abnormal application behaviors. The other options mentioned do not directly relate to the installation of an unauthorized application and therefore are less likely to be the cause of the reported symptoms.
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