There is a growing subculture of collectors who preserve phones in their original, carrier-blobbed state. They want the US Cellular boot animation (a sweeping blue and white logo), the carrier bloatware (think “My Account,” “Backup Assistant,” and a forgotten game demo), and the original TouchWiz launcher with its “Nature” sound effects.
The stock ROM for the SCH-R530 is based on Android OS, specifically the Jelly Bean and Ice Cream Sandwich iterations.
On the surface, the question seems absurd. The Galaxy S3 is a 2012 device, and US Cellular has since migrated entirely to VoLTE (which the S3 does not support). However, three specific user groups are still hunting for these ROMs:
Firmware is identified by the PDA and Phone (Modem) versions.
Flashing stock firmware often wipes user data. Backup your contacts and messages before proceeding. Where to Download the Stock ROM