hi,
I find an article that GPRS of prolink PHS100 works in debian, i did the same for fedora 11 and use the wvdial to connect, but the problem is when usb modem just get connected to the net, the modem is disconnecting from the usb port, which cause to disconnect the net as well, this is the error in /var/log/messages:
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Aug 13 18:18:23 user NetworkManager: <info> (ttyUSB1): ignoring due to lack of mobile broadband capabilties
Aug 13 18:18:23 user NetworkManager: <info> (ttyUSB2): ignoring due to lack of mobile broadband capabilties
Aug 13 18:18:25 user kernel: scsi 9:0:0:0: Direct-Access PROLINK MMC Storage 2.31 PQ: 0 ANSI: 2
Aug 13 18:18:25 user kernel: sd 9:0:0:0: [sdc] Attached SCSI removable disk
Aug 13 18:18:25 user kernel: sd 9:0:0:0: Attached scsi generic sg4 type 0
Aug 13 18:20:57 user kernel: PPP generic driver version 2.4.2
Aug 13 18:20:57 user pppd[5092]: pppd 2.4.4 started by root, uid 0
Aug 13 18:20:57 user pppd[5092]: Using interface ppp0
Aug 13 18:20:57 user pppd[5092]: Connect: ppp0 <--> /dev/ttyUSB2
Aug 13 18:20:57 user pppd[5092]: CHAP authentication succeeded
Aug 13 18:20:57 user pppd[5092]: CHAP authentication succeeded
Aug 13 18:20:57 user kernel: PPP Deflate Compression module registered
Aug 13 18:20:57 user kernel: hub 1-0:1.0: port 4 disabled by hub (EMI?), re-enabling...
Aug 13 18:20:57 user kernel: usb 1-4: USB disconnect, address 12
Aug 13 18:20:57 user kernel: generic ttyUSB0: generic converter now disconnected from ttyUSB0
Aug 13 18:20:57 user kernel: usbserial_generic 1-4:1.0: device disconnected
Aug 13 18:20:57 user kernel: generic ttyUSB1: generic converter now disconnected from ttyUSB1
Aug 13 18:20:57 user kernel: usbserial_generic 1-4:1.1: device disconnected
Aug 13 18:20:57 user kernel: generic ttyUSB2: generic converter now disconnected from ttyUSB2
Aug 13 18:20:57 user pppd[5092]: Modem hangup
Aug 13 18:20:57 user pppd[5092]: Connection terminated.
Aug 13 18:20:57 user kernel: usbserial_generic 1-4:1.3: device disconnected
Aug 13 18:20:57 user kernel: usb 1-4: new high speed USB device using ehci_hcd and address 13
Aug 13 18:20:57 user pppd[5092]: Exit.
Aug 13 18:20:58 user kernel: usb 1-4: device descriptor read/64, error -71
Aug 13 18:20:58 user kernel: usb 1-4: device descriptor read/all, error -71
Aug 13 18:20:58 user kernel: usb 1-4: new high speed USB device using ehci_hcd and address 14
Aug 13 18:20:58 user kernel: usb 1-4: device not accepting address 14, error -71
Aug 13 18:20:58 user kernel: usb 1-4: new high speed USB device using ehci_hcd and address 15
Aug 13 18:20:58 user kernel: usb 1-4: device descriptor read/all, error -71
Aug 13 18:20:59 user kernel: usb 1-4: new high speed USB device using ehci_hcd and address 16
Aug 13 18:20:59 user kernel: usb 1-4: New USB device found, idVendor=1e0e, idProduct=9000
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this is the lsusb:

Bus 003 Device 002: ID 1130:f211 Tenx Technology, Inc. audio headset
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 017: ID 1e0e:9000 (this is usb modem)
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

this is wvdial.conf:

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init3 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Init4 = AT+CGDCONT=1,"IP",""
Password = ''
Phone = *99#
Modem Type = Analog Modem
Stupid Mode = yes
Baud = 9600
Dial Command = ATDT
Modem = /dev/ttyUSB2
ISDN = 0
Username = ''


this is the link for /var/log/messages in more detail:

http://uploading.com/files/T93S8D0H/messages.html