Previously, ifconfig would show 3 entries: enp0s25, lo and ppp0, with ppp0 being the phone; now all that ifconfig shows is the first two.
The response to the phone, now, of dmesg is:-
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[ 1977.118815] usb 8-5: new high-speed USB device number 4 using ehci-pci
[ 1977.277412] usb 8-5: New USB device found, idVendor=04e8, idProduct=689e, bcdDevice= 4.00
[ 1977.277418] usb 8-5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1977.277420] usb 8-5: Product: Samsung Android USB Device
[ 1977.277423] usb 8-5: Manufacturer: SAMSUNG Electronics Co., Ltd.
[ 1977.277426] usb 8-5: SerialNumber: I55004741e82e
[ 1977.280448] usb-storage 8-5:1.3: USB Mass Storage device detected
[ 1977.280613] scsi host4: usb-storage 8-5:1.3
[ 1977.561903] cdc_acm 8-5:1.0: ttyACM0: USB ACM device
[ 1977.564860] usbcore: registered new interface driver cdc_acm
[ 1977.564862] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[ 1978.307611] scsi 4:0:0:0: Direct-Access SAMSUNG GT-I5500 Card 0000 PQ: 0 ANSI: 2
[ 1978.310088] sd 4:0:0:0: Attached scsi generic sg2 type 0
[ 1978.339597] sd 4:0:0:0: [sdb] Attached SCSI removable disk
so I don't know whether the problem is with that response or, perhaps, with the Network manager or something else.
I can still use my usb MBB dongle; then the output of ifconfig is as it used to be {& it's shown as wwan0}:-
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enp0s25: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 00:24:81:f7:be:c1 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 22 memory 0xd8800000-d8820000
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 4922 bytes 718664 (701.8 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4922 bytes 718664 (701.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wwan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 92.41.70.45 netmask 255.255.255.252 broadcast 92.41.70.47
ether 9a:e5:7f:a8:10:85 txqueuelen 1000 (Ethernet)
RX packets 723 bytes 885454 (864.7 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 525 bytes 62311 (60.8 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0