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Getting your phone unlocked here is usually no problem, some place will do it while you wait.
If you can do it before you arrive that will put your mind at risk.

Never used a hyper-card here, just a local 3G card. No problems and speeds are pretty decent in the cities

Thank you for answering !
Do you have an idea of the unlocking cost in Saigon then ?
(Even if I think it won't be really pricey...)

apricot_purin wrote:

Thank you for answering !
Do you have an idea of the unlocking cost in Saigon then ?
(Even if I think it won't be really pricey...)

Don't worry too much about unlocking cost here in Saigon because so many of shops you can see in same street with same business(eg: 3/2 street, HCMC) as competitors and of course they offer the cheapest fee. If you have a Vietnamese friend here, it would be much easier and feel safe during the first time. Wish you a peaceful and happy life in Vietnam!

It was pretty straight forward to unlock iPhone's, for us I'm Australia anyway. I just told my carrier that I was going overseas and needed my phone unlock.
Another way is call Apple up.
All free.

Thank you all for your answers !
I'm going to start here; and if it costs too much or I simply cannot, I'll do it in Vietnam.
No problem in Vietnam, I go with my parents and we have a lot of relatives there who are really happy to help us to find or advise on something. It is just that in electronic stuff... I'm not sure that they know.