Hi I just got a brand new iphone 6, I got a new nano sim card with my old number, however I was so keen to start using it I set the phone up last pm before my new sim was activated and now I cant unlock the phone it's not accepting my passcode.
Welcome to the community and thanks for posting. Sorry to hear your new iPhone 6 is locked. I'll try my best to provide an answer for you.
Are you saying you have set a screen lock for the iPhone and forgot that? If so, then there is nothing we can do to recover this as it is private to the handset. You can see how to restore the phone here.
Hope this helps. Let me know if you have any further questions.