I've just switched my mums sim card in her iphone 5 from spark to vodafone. The phone tells me that it is sim locked but Spark insist that they have never locked any of the iphones.
What I thought should be a straight forward operation is turning into a mission. I've done extensive googling and reset the phone back to factory settings (due to a missed update). The phone also tells me it needs to be activated but won't let me do it either via wifi or tethered as the sim card isn't valid.