区号 大不列颠及北爱尔兰联合王国 区号大不列颠及北爱尔兰联合王国: 市/镇或地区 区号 1.Oakham015722.Oban016313.Okehampton018374.Oldmeldrum016515.Omagh (Northern Ireland)028826.Orkney018567.Orpington016898.Oswestry016919.Oxford01865