ZIYARD.A.I wrote:
DEAR SIR
I NEED TO UNLOCK MY I PHONE 4 TO USE WITH NEW CARRIER.
AWAITING YOUR PROMPT HELP
ZIYARD.A.I
Sorry, you're not addressing Apple here.
Second and iphone 4 can't be updated to IOS 8.
Third only the carrier that the phone is locked to is authorized to unlock your phone, so contact them.