使用moderm指令查询如下，是不是和 固件支持的 连接协议有关 cdma-evdo, lte。同样环境 Hardware | manufacturer: Quectel
| model: EM05
| firmware revision: EM05EFAR06A06M4G
| supported: gsm-umts, lte
| current: gsm-umts, lte
这个就正常
mmcli -m 0
General | path: /org/freedesktop/ModemManager1/Modem/0
| device id: 969d7f57e8fd085c69b2b65afcf8aa58fe26be3d
Hardware | manufacturer: QUALCOMM INCORPORATED
| model: QUECTEL Mobile Broadband Module
| firmware revision: EM05CNFDR08A03M1G_ND
| carrier config: Volte_OpenMkt-Commercial-CMCC
| carrier config revision: 05012071
| h/w revision: 10000
| supported: cdma-evdo, lte
| current: cdma-evdo, lte
| equipment id: 863863064908335
System | device: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-7
| drivers: option, qmi_wwan
| plugin: quectel
| primary port: cdc-wdm0
| ports: cdc-wdm0 (qmi), ttyUSB0 (qcdm), ttyUSB1 (gps),
| ttyUSB2 (at), ttyUSB3 (at), wwan0 (net)
Status | lock: sim-pin2
| unlock retries: sim-pin (3), sim-puk (10), sim-pin2 (3), sim-puk2 (10)
| state: connected
| power state: on
| access tech: lte
| signal quality: 96% (recent)
Modes | supported: allowed: 2g; preferred: none
| allowed: 3g; preferred: none
| allowed: 4g; preferred: none
| allowed: 2g, 3g; preferred: 3g
| allowed: 2g, 3g; preferred: 2g
| allowed: 2g, 4g; preferred: 4g
| allowed: 2g, 4g; preferred: 2g
| allowed: 3g, 4g; preferred: 4g
| allowed: 3g, 4g; preferred: 3g
| allowed: 2g, 3g, 4g; preferred: 4g
| allowed: 2g, 3g, 4g; preferred: 3g
| allowed: 2g, 3g, 4g; preferred: 2g
| current: allowed: 2g, 3g, 4g; preferred: 4g
Bands | supported: eutran-1, eutran-3, eutran-5, eutran-8, eutran-34,
| eutran-38, eutran-39, eutran-40, eutran-41, cdma-bc0
| current: eutran-1, eutran-3, eutran-5, eutran-8, eutran-34,
| eutran-38, eutran-39, eutran-40, eutran-41, cdma-bc0
IP | supported: ipv4, ipv6, ipv4v6
3GPP | imei: 863863064908335
| enabled locks: fixed-dialing
| operator id: 46000
| operator name: CMCC
| registration: home
| packet service state: attached
3GPP EPS | ue mode of operation: csps-2
| initial bearer path: /org/freedesktop/ModemManager1/Bearer/0
| initial bearer ip type: ipv4v6
CDMA | meid: A100007AF38E31
| esn: 80E8D500
| activation: not-activated
SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/0
| sim slot paths: slot 1: /org/freedesktop/ModemManager1/SIM/0 (active)
| slot 2: none
Bearer | paths: /org/freedesktop/ModemManager1/Bearer/1