Page 1 of SAMAUNG 400I

Please if anyone can help. Bought a samsung 400i for a second phone but it won`t work. starts up as O2 but got my orange sim in it, pay monthly, just says limited service.
O2 say its never been on their network, orange cant help, to them the icme number doesn`t exist, local market says its unlocked, But i did get it to ring a number once!!
Surely its something silly. Any ideas will be gratefully received

Thanks

Dodger