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Your phone is probably locked to a certain network (i.e. Vodafone) and can be unlocked (after a certain time) by requesting a NAC (Network Access Code) from your old service provider. If you use a phone that is locked to a certain network provider and your phone is NOT SIM free (meaning you can use any SIM in the phone from any network) then you will need a NAC to unlock it from you old service provider.
The Vodafone SIM card will only work on the Vodafone mobile network. If you want to use different mobile provider then you need to purchase a new SIM card from that mobile provider.
If you intend to use your old mobile phone that was connected to Vodafone, then if this mobile phone is locked to Vodafone, then the new SIM card from a different mobile provider will not work in the old mobile phone unless it has been unlocked to allow you to use any SIM card/mobile provider.
If you need to unlock this mobile, then please leave me a comment so I can provide you with further information.
In this case take out the sim card and try in the other handset, If it works then there is a problem in you're Handheld (You need to walk into the service center to get it repaired), If it did not work you need to contact you're service provider for the Duplicate sim card.
I would try contacting Lg, go on lgmobile.com for help. Lg mobile phones generally have a lot of problems with them and it may need to be sent back to the manufactor or place of purchase.
The other thing that might be causing this problem is your network, if so have the phone "unlocked" try searching for mobile unlocking on the net, and then insert a more well known sim card,
i.e O2, vodafone or orange, O2 being the biggest and in my opinion the best.