Originally Posted by
Windows Central Question soon as the phone starts it say emergency call only and it s a 3 network sim( pay as u go)
As RumoredNow said, its most likely a non-3 phone that's still locked to the existing carrier.
If this is your phone that you moved network, try contacting the existing carrier for the unlock code, if you've been with them for more than 12months and don't have any monies outstanding, most (if not all) will unlock for free, else they'll charge £20. Which is still cheaper (and safer) then using a third-party unlock service.
G.