many a times i am unable to find my mobile on the network applet.

i am able to connect to internet through my samsung s5620(both wireless/usb wire) the first time as i start my pc but if i disconnect it and tries again then it do not connects in any of the way..
also the wired connection breaks after some time whensoever it connects and then do not connects later as my mobile disappears from networkmanager applet.
thanx

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: udev 162-2
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
NonfreeKernelModules: nvidia
Architecture: i386
Date: Sat Jul 23 11:33:14 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
MachineType: Hewlett-Packard Compaq Presario CQ50 Notebook PC
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-22-generic root=/dev/sda2 loop=/hostname/disks/root.disk ro quiet splash
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: udev
dmi.bios.date: 10/03/2008
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.25
dmi.board.name: 303C
dmi.board.vendor: Wistron
dmi.board.version: 08.45
dmi.chassis.type: 10
dmi.chassis.vendor: Wistron
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.25:bd10/03/2008:svnHewlett-Packard:pnCompaqPresarioCQ50NotebookPC:pvrF.25:rvnWistron:rn303C:rvr08.45:cvnWistron:ct10:cvrN/A:
dmi.product.name: Compaq Presario CQ50 Notebook PC
dmi.product.version: F.25
dmi.sys.vendor: Hewlett-Packard