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AT&T 3G Sunset Guide

AT&T is phasing out the 3G network in February 2022 to make room for even better that will improve the AT&T experience. This change will affect all 3G only devices and also impact some LTE capable devices.

This guide introduces the configuration of modifying UE (voice or data) of the modules we provide to Data Centric to meet the requirements of the AT&T 3G network sunset solution.

📢 Announcement

Sixfab CORE users don't need to make any configuration changes, it maintains it for you. Please upgrade your CORE Manager version to 1.8.0+ to apply this change.

Also, during a combined attachment, the modem connects to both the circuit switched (CS) and packet switched (PS) networks when connecting to AT&T's 4G LTE network. This can result in losing data sessions when trying to connect to AT&T US's 4G LTE and LTE-M networks.

To avoid this, configuring your modem to use a PS-only mode may allow your affected device to successfully connect to AT&T because the device won’t perform a combined attachment (LTE + 2G/3G). Below is what command to use to do this configuration.

Applicable Modules

Impacted variants are listed below.

Telit

LE910Cx Family:
  • LE910C1-NF
  • LE910C4-NF

The following Part Numbers of LE910C family will be updated with the new setting:

LE910C1-NF:

Part NumberSW version
LE910C1N503T7F100025.20.263
LE910C1N504T0F100025.20.264
LE910C1NF06R067300M0F.260006
25.20.266 + 25.20.296 + 25.20.236
LE910C1NF06T067200M0F.260006
25.20.266 + 25.20.236 + 25.20.296
LE910C1NF08R087800M0F.260008
25.20.268 + 25.20.238 + 25.20.298
LE910C1NF08T087600M0F.260008
25.20.268 + 25.20.238 + 25.20.298


LE910C4-NF:

Part NumberSW version
LE910C4NF06R067200M0F.660006
25.20.666 + 25.20.646 + 25.20.696
LE910C4NF06T067200M0F.660006
25.20.666 + 25.20.646 + 25.20.696
LE910C4NF06T067400M0F.660006
25.20.666 + 25.20.696 + 25.20.646
LE910C4NF08T087600M0F.660008
25.20.668 + 25.20.648 + 25.20.698

Quectel

ModuleSW version
EC25-AEC25AGBR05A05M4G
EC25AGBR05A06M4G
EC25AFAR05A04M4G
EC25AFAR05A05M4G
EC25AFAR05A06M4G
EC25AFAR05A07M4G
EG25-GEG25GGBR07A06M2G
EG25GGBR07A07M2G
EG25GGBR07A08M2G
EG25GGDR07A07M2G
EG25GGCR07A02M1G

Software Configuration

For Telit Modules

In Telit modules, this can be avoided by updating the UE usage setting in the cellular module with the AT command. Execute the following AT command.

AT+CEMODE=2

For the modules in the field, it will be sufficient to send the AT+CEMODE=2 or to update the module FW.

Set operating mode only in PS mode.

AT+CGCLASS=CG

The updated FW will be available for all SW variants. All future maintenance releases will include the new setting.

For Quectel Modules

In Quectel modules, execute the following AT commands in turn to configure UE as Data-Centric required by AT&T.

AT+QNVFW="/nv/item_files/modem/mmode/ue_usage_setting",01

Query current configuration.

AT+QNVFR="/nv/item_files/modem/mmode/ue_usage_setting"

Expected return should be +QNVFR: 01

Set operating mode is only in PS mode.

AT+QCFG=“servicedomain”,1,1

Reboot the Module.

AT+CFUN=1,1