My sim does not appear to be supported as I have had a message saying the SIM card is not supported by a network provider under the activation policy currently assigned by the activation server.
Can you please unlock my phone
iPhone 6, iOS 12
Only the carrier can unlock it to be used with a new carrier.
How to unlock your iPhone for use with a different carrier - Apple Support
Only the carrier can unlock it to be used with a new carrier.
How to unlock your iPhone for use with a different carrier - Apple Support
iPhone unlock
