Which sign may indicate that malware is present on a mobile device?

Excessive power drain is a significant indicator that malware may be present on a mobile device. This happens because many types of malware run processes in the background that consume battery power. When a device operates normally, users have a reasonable expectation of battery life based on their usage patterns. If the battery depletes much faster than usual without any changes in how the device is used, it raises suspicions that malicious software might be actively running processes that are not visible to the user.

In contrast, the other signs do not directly indicate the presence of malware. A camera LED that is never lit does not imply malicious activity, as that could just be a normal feature or setting of the device. Similarly, improved data usage might suggest a more active use of apps or services rather than malware activity. An unchanged monthly bill typically indicates that data usage, calls, and texts are consistent with prior months, further reducing the likelihood of undetected malware that could generate unexpected charges or data usage spikes.