H3C系列4G路由器故障：无法切换至4G线路

故障信息：

<a_flc>dis ip int b
*down: administratively down
(s): spoofing (l): loopback
Interface Physical Protocol IP Address Description
Aux0 up down -- --
E-Ch4/0:0 down up(s) -- --
GE0/0 down down ------------ --
GE0/1 down down -- --
GE0/2 down down -- --
GE0/27 down down -- --
Loop0 up up(s) ------------ --
Vlan1 up up ------------ --
<a_flc>dis cell 4/0
Cellular4/0:
Modem State:
Hardware Information:
Model: U8300C
Manufacturer: LONGSUNG
Modem Firmware Version: QA30002.1.3_MV11(4534_1.1.4_L0602)
International Mobile Equipment Identity (IMEI):
Mobile Equipment Identifier (MEID):
Hardware Version: 30000
Factory Serial Number (FSN):
Modem Status: Online
Modem Status: IPv4 Unkown.
Modem Status: IPv6 Unkown.
Profile Information:
Profile index: 1
PDP Type: IPv4v6
Header Compression: Off
Data Compression: Off
Access Point Name (APN):
Authentication: PAP
Username:
* - Default profile
Network Information:
Current Service Status: Limited
Registration Status: Searching
Current Roaming Status: Roaming
Current Data Bearer Technology: Unknown
Network Selection Mode: Automatic
Current IP address Mode: Cellular-alloc
Current IPV6 address Mode: Unknown
Mobile Country Code (MCC): 460
Mobile Network Code (MNC): 01
Radio Information:
Technology Preference: No preference specified (AUTO)
Technology Selected: GSM
Configured LTE Band = 1,3,38,39,40,41
GSM related info:
Current RSSI: -70 dBm
Modem Security Information:
PIN Verification: Unknown
PIN Status: Not Initialized
SIM Status: Not Inserted
Error Information:
IPv4 dialing failed: N/A
IPv6 dialing failed: N/A

GPS Information:
GPS Info:
GPS State: Enabled
GPS Mode Configured: Standalone
Latitude(WGS84): 29 Deg 59 Min 59.99 Sec North
Longitude(WGS84): 103 Deg 59 Min 60.00 Sec East
Timestamp (UTC): 00/00/0000 00:00:00
Local time: 00/00/0000 00:00:00
Heading: 0.00, Velocity Horiz: 0.00, Velocity Vert: 0.00
Height (MSL): 31.00 m
Satellite Info:

 

解决方案：

将设备关机，然后把4G模快中的Sim卡重新安装，然后开机检测。