I am about to come to my 21 months of my $34 dollar plan ($4) being the plan, Just called and said they will give me a new phone by next month.
Is the phone possible to sell or will it be locked to my sim? I'm thinking of getting the nexus 5. Any barriers or anything I should be careful of? Disregard insurance and warranty for resale? I don't think vodafone offer the nexus 5 on their plans.
Phones are never locked to the SIM, but may be locked to the carrier.
Go to http://www.vodafone.com.au/unlock any time and unlock it for free (for contracted phones).