英语翻译上个月,我姐姐给我一个iphone3gs,3.1.3固件,但我丢失了SIM卡和号码.现在我有急事,但不在英国,我

Last month,my sister gave me an iphone 3gs 3.1.3 fireware.but I lost the SIM card and the number.my iphone was locked. Now,I'm eager to use it ,but I'm not in England ,so i cann't get an O2 SIM card.Please unlock my iphone.Thank you very much.