I need a unlock code for my nokia 6151 from 3 network ireland so i can put in my o2 ireland simcard

You cannot unlock this phone at free of cost.But you can get the unlock code for your Nokia 6151 phone at low cost from Mobile-Unlocker.com here you need to specify your country, Network name to which it is locked, IMEI number of your phone. Then they deliver unlock code to you through mail with unlocking instructions. Using this you can unlock your phone from Network lock easily.

You can get unlock code for your Nokia 5230 from ireland o2 network at Superunlockcodes.com. Here they deliver unlock code to you via mail.

just buy a new phone from O2 for 20 euros with a sim its cheaper and easier

You can Try Unlock code for the Nokia E52 Locked to that Particular Network,You can try Unlock code at
http://www.prounlocking.com/nokia-e52/rs8wp9/

you can get the network unlock code for your Nokia model mobile, through this site http://www.theunlockarena.com/supported-networks/rs13wp11/
It provides the best instructions and methods for unlocking nokia mobile phones..........

go to the operator o2 ireland.must unlock network code

Recently,I unlock nokia6151 from the site http://www.mobileunlockguide.com/mug/default.aspx
It has the best unlocking instructions.
Try this and gain solutions.

the phone may not be picking up your network it could be a tri-band on 850mhz/1800/1900 or 900mhz/1800/1900mhz you will need to check the manual to see if it works with your simcard

that is a BB5 phone which means that there is no calculated code for that model as yet....you will have to take the phone to a professional unlocker to have the phone unlock using special equipment.

or you can have it unlock unlock online for a small fee....just search yahoo for " unlocks for nokia 6300"