I am have been using the same Vietttel sim card number for 3 years now and have linked my passport to my mobile number just before 24/4/18 law came into force. I am pretty sure I also paid a fee to register the number to my name for a year too. But I am going to be out of Vietnam for 2 to 3 months now till My 2019 and wiithout roaming (it doesn't seem to work). I just want to ask if anyone has experience of how long they can stay out of the Vietnam and then return to Vietnam and still have their sim card working? I guess it is 60 days till deactivation? I was out for 56 days in 2018 and it still worked on return. Or is it 90 days? I topped my sim ccard up on 27/2 in Vietnam.
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