Carrier pack
A carrier pack is one sales code’s carrier settings in a Galaxy firmware: its APNs, feature switches and the SIMs it is for. Samsung names each by a three-letter sales code (TMB, VZW, ATT). This site lists them as Galaxy carriers.
Where it comes from
A Galaxy firmware, as Samsung’s firmware update server (FUS) serves it, is a zip of tar members: BL, AP, CP, CSC, HOME_CSC and USERDATA. The packs are in the CSC member, inside optics.img.lz4, an LZ4-compressed filesystem image (ext4 or EROFS). Each pack is a conf/ directory: configs/carriers/<code>/conf in US firmware, configs/carriers/single/<code>/conf elsewhere.
US firmware is multi-CSC: one firmware carries the pack of every US sales code. The SM-S942U firmware served for ATT and for VZW has identical BL, AP, CP, CSC and HOME_CSC members; only USERDATA differs. So this site reads each firmware once, named by its CSC build: S942UOYN4BZID (Galaxy S26, Android 17) carries 19 packs.
Samsung offers a model’s current firmware, not an archive of past builds, so a Galaxy’s history on this site starts when the site began reading it. Which models are read is on About.
Files
From S942UOYN4BZID, the TMB pack:
| File | What |
|---|---|
omc.info | the pack’s version (SAOMC_SM-S942U_OYN_TMB_17_0013), its model, a catalog of its parts and their editions, and its carrier list: the SIMs that select it |
customer.xml | general information, the data profiles (APNs), and which profile serves each role (ProfBrowser, ProfMMS, ProfIMS) |
system/cscfeature.xml | CscFeature_* switches for the whole pack |
system/customer_carrier_feature.json | CarrierFeature_* switches per carrier group and per Samsung carrier ID |
imsservice/operator.json | not in the firmware’s pack: the pack’s IMS operator, which this site adds. See IMS |
The two feature files may be encoded: a gzip stream with each byte rotated and XORed against a 256-byte table, as worked out by fei-ke/OmcTextDecoder. Samsung reuses packs across models: four of the Galaxy S25’s name the S23 or S24 Ultra in their omc.info.
SIM selection
The carrier list in omc.info holds the pack’s SIM rules. A rule has an MCC and MNC, and may add a GID1 (gid, in hex, or in decimal when codeType is DEC), a GID2, an SPN, a subset code (the IMSI digits after the network code) or an ICCID prefix.
TMB has 45 rules: 13 T-Mobile MCC-MNCs (310160 to 310800), each alone and with GID1 544D or 6D38; GID1 544D on 311490, 311882 and 312250; GID1 504E on 311660; and the test networks 00101 and 99999. Every pack’s rules are on its page: TMB.
IMS
VoLTE, Wi-Fi Calling and the rest of a Galaxy’s IMS settings are not in the pack. They are in the IMS service in the AP member’s system partition, system/priv-app/imsservice/imsservice.apk, as JSON files in its res/raw/:
| File | What |
|---|---|
mnomap.json | SIM rules naming an operator (mnoname, such as TMobile_US) |
imsswitch.json | each operator’s IMS services switched on or off, over defaultswitch |
imsprofile.json | each operator’s registration profiles: PDN, IP version, SIP timers |
globalsettings.json | each operator’s other settings, over defaultsetting |
This site matches a pack’s SIM rules against mnomap.json and keeps the operator most of them name, among those with switches, as imsservice/operator.json. TMB’s operator is TMobile_US. In the SM-S948U firmware S948UOYN4BZID, 17 of the 19 packs have one.
Versions
A pack’s version is the end of its omc.info version, _<Android version>_<revision>: SAOMC_SM-S942U_OYN_TMB_17_0013 is version 17.0013. Packs differ per model, so on this site a pack’s versions sit under a model, as a Pixel’s carrier files sit under a Pixel: TMB on the Galaxy S26.
See also
- Galaxy modem configuration: the modem’s own per-carrier settings
- carrier_list.pb: how a Pixel matches a SIM
- Carrier Bundle: the iOS counterpart