Unlocked iphone not activating sim over wifi

[Anonymous]

I have an unlocked iphone4 that was locked to the o2 network. When I try to activate a sim of a different carrier over wifi it doesn't activate, it says no service. 

[MI5]

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@Anonymous wrote:

Is it possible to get the phone unlocked again if it hasn't worked properly

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Yes but you can only do it from the original network.

[Anonymous]

Yes it does work fine otherwise. I have to decide whether to send it back for a refund?

[MI5]

Check if it's barred or not first then we can work from there.

[Anonymous]

I have checked. The phone is not barred. Should I ask the seller I bought the phone from to try to unlock it again?

[Cleoriff]

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@Anonymous wrote:

I have checked. The phone is not barred. Should I ask the seller I bought the phone from to try to unlock it again?

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Well you can do that yourself using the links I first posted as you have the phone now?

Unless @MI5 advises differently....

[Anonymous]

Is the imei the original one? Just thinking incase it's a refurb handset

[Anonymous]

I put *#06# into the phone and got the imei number

[Cleoriff]

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@Anonymous wrote:

I put *#06# into the phone and got the imei number

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Have you checked that the IMEI is not barred via the checkmend link MI5 gave you?

[MI5]

OK, so the phone is not barred....
Put the o2 sim in the phone and then connect it to iTunes.
It should pop up a message saying unlock is complete (or similar).

[Anonymous]

Yes it's not barred. 

Will I be able to unlock the phone again from O2 for free if I don't have the original details? I may have to go back to the seller to do this or I should ask for a refund