If you just jailbreak it without changing the baseband to 06.15.00 then you can always restore it back to how it is now. You will only be taking a risk if you change the baseband.
It's more than likely that the phone will be blacklisted. If this is a UK handset it won't matter if you unlock it, it still won't work in the UK.
If in doubt call vodafone & ask them to check the IMEI for blacklisting.
It's more than likely that the phone will be blacklisted. If this is a UK handset it won't matter if you unlock it, it still won't work in the UK.
If in doubt call vodafone & ask them to check the IMEI for blacklisting.

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