My sister's 830 has been playing up, but it's locked to EE, and I don't have a spare EE SIM and I'm not sure if the problems are SIM or phone related. I've flashed it from the EE variant to the unbranded GB Country Variant, but the SIM lock remains. I thought that the SIM lock was removed when flashing with a CV? Is there a way to unlock it easily without paying the network?