I want to clarify the situation a little about ATT-shnyh devices, which mysteriously learned to catch 4G in Russia. After unpacking the ATT flash, the following was found in the registry
059S9T1: RM-877 US ATT, 3045.0000.1325
[HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Shell \ OEM \ SystemTray \ DataConnectionStrings]
"UMTS_HSPAPLUS" = "4G"
"TDSCDMA_DC_HSPAPLUS" = "H"
"TDSCDMA_DEFAULT" = "3G"
"EVDO_REVB" = "DO"
"EVDO_REVA" = "DO"
"TDSCDMA_HSUPA" = "H"
"UMTS_HSPAPLUS_64QAM" = "4G"
"UMTS_HSUPA" = "4G"
"UMTS_UMTS" = "4G"
"1XRTT" = "1X"
"TDSCDMA_UMTS" = "3G"
"EVDO_REV0" = "DO"
"TDSCDMA_HSPAPLUS" = "H"
"1XRTT_DEFAULT" = "1X"
"LTE_DEFAULT" = "LTE"
"UMTS_DEFAULT" = "4G"
"GSM_DEFAULT" = "G"
"LTE_FDD" = "LTE"
"UMTS_DC_HSPAPLUS" = "4G"
"GSM_GPRS" = "G"
"EVDO_DEFAULT" = "DO"
"UMTS_HSDPA" = "4G"
"GSM_EDGE" = "E"
"TDSCDMA_HSDPA" = "H"
"LTE_TDD" = "LTE"
059T3M3: RM-877 LIGHT SWAP ENGINE GLOBAL, 3049.0000.1330
[HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Shell \ OEM \ SystemTray \ DataConnectionStrings]
"UMTS_HSPAPLUS" = "H +"
"TDSCDMA_DC_HSPAPLUS" = "H +"
"TDSCDMA_DEFAULT" = "3G"
"EVDO_REVB" = "DO"
"EVDO_REVA" = "DO"
"TDSCDMA_HSUPA" = "H"
"UMTS_HSUPA" = "H"
"UMTS_UMTS" = "3G"
"1XRTT" = "1X"
"TDSCDMA_UMTS" = "3G"
"EVDO_REV0" = "DO"
"TDSCDMA_HSPAPLUS" = "H +"
"1XRTT_DEFAULT" = "1X"
"LTE_DEFAULT" = "4G"
"UMTS_DEFAULT" = "3G"
"GSM_DEFAULT" = "G"
"LTE_FDD" = "4G"
"UMTS_DC_HSPAPLUS" = "H +"
"GSM_GPRS" = "G"
"EVDO_DEFAULT" = "DO"
"UMTS_HSDPA" = "H"
"GSM_EDGE" = "E"
"TDSCDMA_HSDPA" = "H"
"LTE_TDD" = "4G"
That is, AT & T deliberately deceives you, and when your phone catches HSDPA / HSDPA +, it presents you as 4G, although in fact it is still 3G. Earlier in my memory only T-mobile indulged in such a substitution of concepts, now it seems that AT & T also went there.
Post has been editedsaintonotole - 30.10.13, 03:44Reason for editing: added comparison with standard firmware