There is data in Vietnam. I searched it. It was like $15/MB.
As some of other carriers have fixed rate for daily data plan, that's what I was asking.
For unlocking the phone, they usually make an exception for international traveler even you didn't pay off your phone.
When you have not finished your payment, only way to do it is through contacting the agents.
Both sets require agent's answer.
Vietnam data is a newer addition, and you are correct, it's $15 a MB. We have different rate options for specific countries, however it appears Vietnam onlt has the $15/MB version.
A limited number of devices are available for a temporary unlock, you can learn more about that process here - T-Mobile Device Unlock app
Otherwise, typically your device will only be unlocked once payment is satisfied. I am not sure what exception the representative you were speaking to was using, but it's not a standard offer or something I often see. It sounds like they may have just been using something to go outside of policy to help you get an unlock, but may have come with a delay. For all our unlocks we say 72 hours, but they typically are closer to 24. Again, I can't speak to the type of unlock they were offering as you don't qualify for a standard.
You do NOT want to activate data in countries like Vietnam. There are many apps on your phone that sip data in the background. You can easily wind up w. a 3 or 4 figure bill for data.
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If you have an iPhone T-mobile can't temp unlock those. You would need to pay off the device then T-Mobile will get Apple to unlock it.