Locking your phone prevents accidental calls, purchases, deleted files and privacy problems. Use PIN/biometrics, short auto-lock, Guided Access/Guest mode and simple habits like face-down storage to avoid pocket dials and unwanted activity.
Ringtones are now driven by apps and user-made clips rather than carrier storefronts. Learn formats (MP3, M4R), how to add tones to Android and iPhone, legal considerations, and practical tips.
MicroSD cards remain a practical way to expand phone storage for photos, video, and offline media. Learn current formats, speed classes, device support, and when a card still makes sense.