Install custom versions of Android — aka ROMs — to gain control over your phone's files and software (and risk losing your warranty). Just create a backup for your current setup, install your ROM of choice, and enjoy expanded features, speedier operation, or simply a new version of Android before your carrier delivers it.
WIRED Install from your SD card. Get screenshots of themes before installing.
TIRED Requires rooting your device. Careless users could brick their phones.