i have an iphone 6 and my phone is saying sim not provisioned

Your wireless carrier handles your SIM provisioning; they add your phone number, account information and type, etc to it. I'd recommend speaking with them, but you can also check this out to start: https://support.apple.com/en-us/HT201420

Hi,

Try the help provided in this support article > If you get an alert about the SIM card in your iPhone - Apple Support