Phone still on O2. No use in other sim - Cell Phones

No need o2 sim card inside on your mobile.
For unlock your phone visit ProUnlocking.com Here you can unlock your phone at low cost.

To unlock your phone You need not have that particular Sim. you can unlock it using your very own sim.You can get the Restriction code for your Nokia 6700 Classic phone from Mobile-Unlocker.com here you need to specify your country,Network name to which it is locked,IMEI number of your phone.

You need to unlock your Vodafone SIM mobile phone to use an O2 SIM to it. You can unlock your phone using unlock code. You can get the unlock code from www.Wickedunlock.com at affordable cost. All the best mate.

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

To unlock it, you need the SIM Subsidy unlock code. This is unique to the individual phone and is provided by the Cell Carrier that originally sold the phone. Once you have the code from them, put your O2 sim into the phone and it should ask for the code. Type it in, then type it again when asked to verify.

After that you'll need to put in the settings for internet and mms for O2. Contact O2 and they may be able to send the settings Over The Air (OTA)

i have a samsung sgh G600 and it from uk and i live in India and when i put my indian sim it asks for network lock

For any china mobile software like drivers and others, just check chinamanuals.com - ask them for a manual.

Looks like you have to take the sim lock of your phone, most of phone shops will do it for you for fiu quid

maybe your o2 sim card is not compatible to your phone.. if ist working toother phones maybe theres a software for that to be able to work..