Lumia shows invalid sim, no option for unlock code

okay. so i have searched a little for a solution and here is basically my problem.
i have bought a phone and when i put in my sim card it says no service. it shows the 5 bar with a "no entry" sign over it.
then occasionally it changes to a sim card with a no entry sign over it,
i dont think the sim is locked to a particular operator as it has no option to unlock it,
my only idea is that it has been locked by police..
thanks for any help

liamht wrote:
okay. so i have searched a little for a solution and here is basically my problem.
i have bought a phone and when i put in my sim card it says no service. it shows the 5 bar with a "no entry" sign over it.
then occasionally it changes to a sim card with a no entry sign over it,
i dont think the sim is locked to a particular operator as it has no option to unlock it,
my only idea is that it has been locked by police..
thanks for any help
u mean you don't think the fone is locked to a particular operator? ...anyway if the fone is locked, i dont  think it would give you any 'unlock' option.. unless you bring it to a cellfone shop so they can unlock the fone (open line) to any network operator.
btw., you might also want to check another known good sim card. or it may be a loose contact in the fone's sim connectors. thats a new fone, isn't it? maybe u can claim warranty for that. didn't u 'test'  it before buying?

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