●Overview
■The purpose of this PCN is to avoid service interruption for certain MultiTech 4G products impacted by the impending AT&T 3G network sunset.
■4G/LTE Category 1, 3 and 4 devices in the U.S. may no longer attach to the AT&T network after their 3G network sunset, scheduled for late February 2022. Voice-capable cellular modules integrated into several ultiTech products are configured for voice-centric signaling by default. These devices are likely to arrive at a No Service condition after 3G sunset -- even for data-only applications. This is a result of the module requiring a voice signal to connect to networks configured to leverage a combined attach (3G and LTE) for LTE device registration.
■The MultiTech products detailed in this PCN will be impacted by the 3G sunset. A software configuration change in the cellular module in these products is required in order to avoid a No Service condition. The only exception is for products with cellular modules supporting the IMS service Voice over LTE (VoLTE) and an accompanying VoLTE subscription from your service provider.
■MultiTech will immediately implement a software configuration change in our manufacturing process to include the required AT command to set a new permanent module default for its User Equipment (“UE”) settings. Note: future module firmware updates may impact this setting.
■Current default: CEMODE=1 (Voice centric)
■New default: CEMODE=2 (Data centric)
■For devices already deployed in the field, you must implement the above mentioned software configuration change in each device to ensure continued service following the 3G sunset. See Suggested Action Plan in Section III for additional details.
■Software change command: AT+CEMODE=2
■Check setting: AT+CEMODE?
■Note: The SIM must be in the device prior to sending these commands.

Brand of Product：	MULTITECH
Part#：	MTC-LNA4-B01-xx 、 MTC-LAT1-xx 、 MTCM-LNA3-B03-xx 、 MTCM-LAT3-B03-xx 、 MTCDT-L4N1-xx 、 MTCDTIP-L4N1-xx 、 MTCDTIP-LAT1-xx 、 MTCAP-LNA3-xx 、 MTR-LAT1-xx 、 MTQ-LAT3-xx 、 MTSMC-L4N1-xx 、 MTSMC-LAT3-xx 、 MTSMC-LAT1-xx 、 MTCDT-LAT1-xx More Part#
Product Category：	Cell Models 、 microCell Models 、 Models 、 AP Models More
Application：	More
Data Type：	PCN/EOL More
Safety & Environment Standards：	More
Operating Temperature：	Please see the document for details
Qualification Grade：	More
Qualification Approval：	More
Package：
Language：	English Chinese Chinese and English Japanese
Date of Creation：	March 9, 2021
Version Number：
Data Encoding：	PCN 03092021-02
Data Size：	511 KB