Initialy i had used my jabra bt350 with sony ericson but now it is not getting paired with my present mobile

Not sure if you have provided the correct model. You need to pair the headset with the corresponding mobile phone and then accept the calls.
Refer this table on the link and select the correct Jabra model and the mobile phone model and you will find the correct instructions.
Bluetooth Pairing Guide

Hi. The passkey will be 4 zeros 0000

how can i connect jabra bt350 to my ipod touch 2g 3.1.3

Before you use your Jabra BT350, you need to pair it with your mobile
phone.
1. Put the headset in pairing mode
• Make sure the headset is off.
• Press and hold the answer/end button until a solid blue light comes on.
2. Set your Bluetooth phone to ‘discover’ the Jabra BT350
Follow your phone’s instruction guide. This usually involves going to a
‘setup,’ ‘connect’ or ‘Bluetooth’ menu on your phone and selecting the
option to ‘discover’ or ‘add’ a Bluetooth device.* (See example from a
typical mobile phone in fig. 5)
3. Your phone will find the Jabra BT350
Your phone then asks if you want to pair with it. Accept by pressing ‘Yes’
or ‘OK’ on the phone and confirm with the passkey or PIN = 0000 (4
zeros).

or go here http://www.jabra.com/sites/Jabra/GNimages/Products/WirelessHeadset/BT350/Documents/BT350_UM_NA_EN_491.pdf

hope this helps

trying to pair my jabra to my lg vx8350 phone

Delete the problem unit off the phone's list then turn the phone off then back on. Next you will have to go through the pairing procedure for the headset again.

BR, I had the same problem with my BT350 and my Razr V3c. I was finally able to resolve the problem by doing the following:
- delete BT350 from device list on Razr
- start Razr looking for device
- put BT350 in pairing mode while phone searching (hold answer button till solid blue light)
- phone will detect BT350 and retrieve name
- select Jabra BT350
- say 'yes' to bond with Jabra BT350
- enter passkey - 0000
- phone will connect with Jabra BT350

try turning bluetooth off . first erase bluetooth connections on phone. turn off phone and take out phone's battery for ten seconds. put battery back in and turn on phone. plug bluetooth into charger for ten seconds and unplug it. try re-pairing bluetooth with phone. This worked for me!

Brand New Jabra -BT350 won't work on my Nokia 6102i, I did everything in term of setting my phone properly to paired with the Bluetooth, My Phone Bluetooth light is on, and the device blue light is flashing as well, but it still doesn't work. the phone would ring, I hit the JABRA button to answer it.....still can't answer my phone... Please send your help to me at [email protected]

thank you all.

From the manual )link below),,,, 1. Put the headset in pairing mode ? Make sure the headset is off. ? Press and hold the answer/end button until a solid blue light comes on. 2. Set your Bluetooth phone to ?discover? the Jabra BT350 Follow your phone?s instruction guide. This usually involves going to a ?setup,? ?connect? or ?Bluetooth? menu on your phone and selecting the option to ?discover? or ?add? a Bluetooth device.* (See example from a typical mobile phone in fig. 5) 3. Your phone will find the Jabra BT350 Your phone then asks if you want to pair with it. Accept by pressing ?Yes? or ?OK? on the phone and confirm with the passkey or PIN = 0000 (4 zeros). http://www.jabra.com/sites/Jabra/GNimages/Products/WirelessHeadset/BT350/Documents/BT350_UM_NA_EN_491.pdf