Sir, I have purchased Nokia 6303 Classic mobile from Germany with O2 sim. Now I want to use the mobile phone with some other Net work SIM. But it will not accept due to SIM locked for O2 germany network only. Kindly give solution to unlock the sim.

Hi free network unlock code are not available for your Nokia 6303 mobile so better purchase unlock code from some reliable paid providers like SimpleUnlocking.com here they are rendering network unlock code for all mobile models at reliable cost .You first check that whether the code is available for your country and network provider .If yes then pay for it and unlock your phone then freely use it with any GSM sim ...

Generating codes won't provide you accurate unlock codes. Trying to unlock with inaccurate unlock codes for more than a limited time may lead to hard lock of your phone. Then your phone may become unusable. So it is wise to get the accurate unlock code from any trustworthy online site. For example you can get accurate unlock code for a Nokia 6303C from www.mobileunlocksolutions.com/nokia-6303-classic/rs1wp9/ at most affordable cost. Here are the steps for unlocking a Nokia 6303 C,
1 - Switch on your Nokia 6303 Classic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 6303 Classic.
3 - Compose #pw+CODE+1#.
4 - The Nokia 6303 Classic would then display the message "SIM Restriction Off" and will be unlocked!

Note :For Nokia 6303 Classic mobile phones locked to the network Fido or Rogers in Canada follow these instructions :
1 - Switch on your Nokia 6303 Classic without any sim card.
2 - Don't bother as to what is displayed on your Nokia 6303 Classic.
3 - Compose #pw+CODE+7#.
4 - The Nokia 6303 Classic would then display the message "SIM Restriction Off" and will be unlocked!

You can get the Subsidy code for Nokia 6303 Classic Phone at here Theunlockspot.com/nokia-6303-classic/rs10wp9/ and Unlock it from network lock...After Unlock it use with any GSM Network Sim card...

you can try downloading this software to help you with the unlocking code.
http://nokia-6303-unlock.fyxm.net/

So now whats your problem? does your mobile says phone restricted? because you have said mobile been used with o2 by the seller and after purchase you have used with ASDA sim? do you want unlock codes? if so try prounlocking to get codes to unlock your mobile..

hi you can use codes to unlock the mobile .to get the codes visit here classicunlocking here they ask the country from where you brought the mobile, provider to which your mobile is locked and the imei number of the mobile.finally they will send the unlock codes.

There can be many ways to Unlock your phone. As far as i know unlocking by codes is the simple and safe way. I will suggest the website http://www.unlock-zone.com/ which is doing good service and they were recommended highly in the cell phone forums.
I used them to unlock my cell phone. contacted them and within 30 mins i had my unlock code and my phone was unlocked.
Hope this helps.

Try restriction codes here http://www.wickedunlock.com/nokia-6303-classic/rs11wp9/

To Open line Nokia 6303 Classic Phone use the Unlock code.Buy the unlock code from here Simpleunlocking.com/nokia-6303-classic/rs16wp9/ and Unlock it from network lock.Then use with any GSM Network Sim card.

Sorry my unlock code calculator doesn't support your model.

www.mobile2mobile.net

Try there..