IPhone 5s blacklisted, so annoying?

I recently bought a phone from gumtree and it worked fine until my provider (virgin) black listed it, now no calls or texts function and this is a huge inconvinience as I paid almost full price for this phone, Wich was brand new in the box. Luckily my cousins from different country want to buy it but my phone is locked to virgin mobile. Even though my iPhone has been blacklisted on a locked network, Is it possible to unlock my phone to all networks still so it can be sold abroad?

No, they have blocked the IMEI number which is embedded in the handset. Sounds like you have bought a stolen phone. It is now useless.
UK

Why would you pay almost full price when you could have just bought a new one and not had any of these issues? You got scammed obviously, I would at least notify gumtree also.

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