Unable to unlock mobile phone - HELP!!!!

haven't_got_a_clue!

I currently have a contract phone (O2, Nokia) - I'm happy with the contract having checked the Which? link.

My daughter has an LG (T Mobile) PAYG phone and has just bought a new PAYG phone Sagem (Vodafone). I thought I would use her old one and followed the guidelines in the MSE guide to unlocking a mobile phone (ie, link to website) I put the details in, but had the following problems:-

1) The IMEI code on the inside of the phone was 15 x digits (which is what the website requested), but was 17 x digits when I put the code (*#, etc) into the phone (the last 2 x digits were 00). I didn't even get as far as the question re which network!

2) I tried this 3 x times, but gave up (I still have the unblock code)

3) Is what I'm trying to do possible (ie, can I use an O2 SIM card in place of the T Mobile SIM card)?

4) I put my daughter's T Mobile SIM back in her LG phone (while her new phone charges and so she can use the credit up), but it says that she's only got 2 x attempts left - should she be putting the unblock code in?

Any help would be much appreciated!

Thanks

drahcir_2

you cannot unlock the lg like this (the codes are for nokias only)
you need to get it direct unlocked -try market stall (about £10)
the nokia on o2 contract you have will prob be unlocked already

haven't_got_a_clue!

Thanks very much - saves me wasting more time. I'll nip to the market tomorrow. (The site I went onto asked me to select from a drop-down menu which included LG, which is why I thought it was possible).