Hi there.

I have just purchased an unlocked phone (previously Vodafone). I have synced it with my iTunes but it is not accepting my 48 SIM. 

The message reads: "Sim Not Valid - The SIM card that you currently have installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier. Please contact Apple for more information."

I have contacted the seller who has spoken to Vodafone. They have assured them that the phone is unlocked. 

Does anyone have any solutions or suggestions please??