no problem is found:
ati3
Manufacturer: Sierra Wireless, Incorporated
Model: RC7620-1
Revision: SWI9X07H_00.08.07.00 0ce4c1 jenkins 2021/03/17 02:18:20
IMEI: 001027009999999
IMEI SV: 17
FSN: 7T9483000706AA
+GCAP: +CGSM
OK
at!gtatus?
ERROR
at!gstatus?
!GSTATUS:
Current Time: 897 Temperature: 34
Modem Mitigate Level: 0 ModemProc Mitigate Level: 0
Reset Counter: 2 Mode: ONLINE
System mode: LTE PS state: Attached
IMS reg state: UNKNOWN IMS mode: Not Support
IMS Srv State: UNKNOWN SMS,UNKNOWN VoIP
LTE band: B1 LTE bw: 15 MHz
LTE Rx chan: 374 LTE Tx chan: 18374
LTE CA state: INACTIVE
EMM state: Registered Normal Service
RRC state: RRC Idle
PCC RxM RSSI: -55 RSRP (dBm): -91
PCC RxD RSSI: -89 RSRP (dBm): -127
Tx Power: -- TAC: 2775 (10101)
RSRQ (dB): -16 Cell ID: 00360A20 (3541536)
SINR (dB): 2.8
OK
AT+KCNXCFG=1,"GPRS","smartone"
OK
AT+KCNXPROFILE=1
OK
AT+KTCPCFG=1,0,"123.123.123.123",5044
+KTCPCFG: 1
OK
at+ktcpcnx=1
OK
+KCNX_IND: 1,4,1
+KCNX_IND: 1,1,0
+KTCP_IND: 1,1