Hi PIX!
you are right, I am in vietnam. I work in viettel network. Thank for your kind.
I don’t understand clearly why you can say that SD fail, the subcribers will not “fell”?
because, they can have to try 2 or 3 times to make a call or sms? they will complain us quality of service.
Can you give me that indicator of Vinaphone or mobile?