You could go to store in the list below. But what is your iphone version??? Because some places could unlock iphone 5 but some place could not. And I dont know where is your place because moving in Ha Noi is a little tired. It is not as easy as you see on the map.
1. 36 Ba Trieu street - district Hoan Kiem - Hanoi, tel: 0935.00.8886
2. 629 Kim Ma street, Hanoi. Tel: 094.943.6666
3. 92 Thai Ha street – district Dong Da – Hanoi. Tel: 0904.038.780
Hope it works for you.