Combination firmware for Samsung SM-G998B Galaxy S21 Ultra 5G Global Dual SIM TD-LTE (Samsung Unbound O3)

CSC stands for Country Specific Code. It is unique for each country or region or network carrier.

- ACG - Nextech / C-Spire
- ATT - AT&T
- BST - BST (unknown)
- CCT - Comcast
- GCF - GCF (unknown)
- LRA - Bluegrass Cellular
- SPR - Sprint (CDMA)
- TFN - Tracfone branded
- TMB - T-Mobile
- USC - USA un
- VMU - Virgin Mobile USA
- VZW - Verizon
- XAA - USA unbranded (default)
- XAS - XAS (unknown)

- BMC - Bell Mobile
- BWA - SaskTel
- CHR - Canada (unknown)
- ESK - EastLink
- FMC - Fido Mobile
- GLW - Globalive Wind Mobile
- KDO - Koodo Mobile
- MTB - Belarus
- RWC - Rogers
- TLS - Telus
- VMC - Virgin Mobile
- VTR - Vidéotron
- XAC - Canada unbranded (default)

- AFG - Afghanistan (AFG)
- TMC - Algeria (TMC)
- ARO - Argentina (ARO)
- ANC - Argentina (ANC)
- UFN - Argentina (Movistar) (UFN)
- PSN - Argentina (Personal) (PSN)
- XSA - Australia (XSA)
- OPS - Australia (Optus) (OPS)
- TEL - Australia (Telstra) (TEL)
- VAU - Australia (Vodafone) (VAU)
- DRE - Austria (3 Hutchison) (DRE)
- MOB - Austria (A1) (MOB)
- MAX - Austria (T- Mobile) (MAX)
- TRG - Austria (Telering) (TRG)
- SEB - Baltic (SEB)
- PRO - Belgium (Proximus) (PRO)
- TEB - Bosnia and Herzegovina (TEB)
- BHT - Bosnia and Herzegovina (BH TELECOM) (BHT)
- ZTO - Brazil (ZTO)
- ZTA - Brazil (Claro) (ZTA)
- ZTR - Brazil (Oi) (ZTR)
- ZTM - Brazil (TIM) (ZTM)
- ZVV - Brazil (VIVO) (ZVV)
- BGL - Bulgaria (BGL)
- GBL - Bulgaria (GBL)
- MTL - Bulgaria (MTL) (MTL)
- VVT - Bulgaria (VVT) (VVT)
- CHO - Chile (CHO)
- CRC - Chile (CRC)
- CHL - Chile (Claro) (CHL)
- CHE - Chile (Entel PCS) (CHE)
- CHT - Chile (Telefonica) (CHT)
- COO - Colombia (COO)
- COM - Colombia (Comcel) (COM)
- COB - Colombia (Movistar) (COB)
- ICE - Costa Rica (ICE)
- CRO - Croatia (T- Mobile) (CRO)
- TWO - Croatia (TELE2) (TWO)
- VIP - Croatia (VIPNET) (VIP)
- CYV - Cyprus (CYV)
- ETL - Czech Republic (ETL)
- O2C - Czech Republic (O2C) (O2C)
- TMZ - Czech Republic (T- Mobile) (TMZ)
- VDC - Czech Republic (Vodafone) (VDC)
- CDR - Dominican Republic (CDR)
- DOR - Dominican Republic (Orange) (DOR)
- ECO - Ecuador (ECO)
- EBE - Ecuador (EBE)
- EGY - Egypt (EGY)
- XEF - France (XEF)
- BOG - France (Bouygues) (BOG)
- FTM - France (Orange) (FTM)
- SFR - France (SFR) (SFR)
- DBT - Germany (DBT)
- XEG - Germany (1&1) (XEG)
- VIA - Germany (O2) (VIA)
- DTM - Germany (T- Mobile) (DTM)
- VD2 - Germany (Vodafone) (VD2)
- EUR - Greece (EUR)
- COS - Greece (Cosmote) (COS)
- VGR - Greece (Vodafone) (VGR)
- PGU - Guatemala (PGU)
- TGU - Guatemala (TGU)
- CGU - Guatemala (Tigo) (CGU)
- XEH - Hungary (XEH)
- TMH - Hungary (T- mobile) (TMH)
- PAN - Hungary (Telenor) (PAN)
- VDH - Hungary (VDH) (VDH)
- THR - Iran (THR)
- MID - Iraq (MID)
- TSI - Ireland (TSI)
- 3IE - Ireland (Three) (3IE)
- VDI - Ireland (Vodafone) (VDI)
- ILO - Israel (ILO)
- CEL - Israel (Cellcom) (CEL)
- PTR - Israel (Orange/Partner) (PTR)
- PCL - Israel (Pelephone) (PCL)
- ITV - Italy (ITV)
- HUI - Italy (H3G) (HUI)
- TIM - Italy (TIM) (TIM)
- OMN - Italy (Vodafone) (OMN)
- WIN - Italy (Wind) (WIN)
- CWW - Jamaica (CWW)
- JDI - Jamaica (JDI)
- AFR - Kenya (AFR)
- BTC - Libya (BTC)
- LUX - Luxembourg (LUX)
- MBM - Macedonia (T- Mobile) (MBM)
- IUS - Mexico (IUS)
- TMM - Mexico (Movistar) (TMM)
- TCE - Mexico (Telcel) (TCE)
- MAT - Morocco (MAT) (MAT)
- MWD - Morocco (MWD) (MWD)
- PHN - Netherlands (PHN)
- TNL - Netherlands (T- Mobile) (TNL)
- VDF - Netherlands (Vodafone) (VDF)
- NZC - New Zealand (NZC)
- TNZ - New Zealand (TNZ)
- VNZ - New Zealand (Vodafone) (VNZ)
- NEE - Nordic countries (NEE)
- TEN - Norway (Telenor) (TEN)
- ATO - Open Austria (ATO)
- PAK - Pakistan (PAK) (PAK)
- TPA - Panama (TPA)
- PNG - Papua New Guinea (PNG)
- CTP - Paraguay (Claro) (CTP)
- PSP - Paraguay (Personal) (PSP)
- PET - Peru (PET)
- SAM - Peru (SAM) (SAM)
- XEO - Poland (XEO)
- PLS - Poland (PLUS) (PLS)
- PRT - Poland (Play) (PRT)
- TPL - Poland (T- mobile) (TPL)
- MEO - Portugal (MEO)
- OPT - Portugal (Optimus) (OPT)
- TPH - Portugal (TPH) (TPH)
- TCL - Portugal (Vodafone) (TCL)
- PCT - Puerto Rico (PCT)
- ROM - Romania (ROM)
- COA - Romania (Cosmote) (COA)
- ORO - Romania (Orange) (ORO)
- CNX - Romania (Vodafone) (CNX)
- WTL - Saudi Arabia (WTL)
- ACR - Saudi Arabia (ACR)
- KSA - Saudi Arabia (KSA)
- XFU - Saudi Arabia (STC) (XFU)
- TMS - Slovakia (TMS)
- ORX - Slovakia (ORX)
- SIO - Slovenia (SIO)
- MOT - Slovenia (Mobitel) (MOT)
- SIM - Slovenia (Si.mobil) (SIM)
- XFE - South Africa (XFE)
- XFA - South Africa (XFA)
- XFV - South Africa (Vodafone) (XFV)
- SEE - South East Europe (SEE)
- PHE - Spain (PHE)
- XEC - Spain (Movistar) (XEC)
- ATL - Spain (Vodafone) (ATL)
- VDS - Sweden (VDS)
- HTS - Sweden (Tre) (HTS)
- AUT - Switzerland (AUT)
- SWC - Switzerland (Swisscom) (SWC)
- EON - Trinidad and Tobago (EON)
- TTT - Trinidad and Tobago (TTT)
- TUN - Tunisia (TUN)
- TUR - Turkey (TUR)
- LYS - United Arab Emirates (LYS)
- XSG - United Arab Emirates (XSG)
- BTU - United Kingdom (BTU)
- EVR - United Kingdom (EE) (EVR)
- H3G - United Kingdom (H3G) (H3G)
- O2U - United Kingdom (O2) (O2U)
- VOD - United Kingdom (Vodafone) (VOD)
- XEU - United Kingdom / Ireland (XEU)
- OPV - Unknown (OPV)
- CHX - Unknown (CHX)
- COE - Unknown (COE)
- DDE - Unknown (DDE)
- CHV - Unknown (CHV)
- BVO - Unknown (BVO)
- ALE - Unknown (ALE)
- AMO - Unknown (AMO)
- ANP - Unknown (ANP)
- VFJ - Unknown (VFJ)
- DHR - Unknown (DHR)
- PNT - Unknown (PNT)
- TTR - Unknown (TTR)
- DNL - Unknown (DNL)
- MTZ - Unknown (MTZ)
- MRU - Unknown (MRU)
- DPL - Unknown (DPL)
- UFU - Uruguay (UFU)
- UPO - Uruguay (UPO)
- CTU - Uruguay (Claro) (CTU)