Sim card registration was mandatory in some countries
I had good connection and most of the times. But the problem started in Hong Kong because I couldn't have any Wi-Fi. And for this reason I was obliged to buy new a new set because I thought the 10 GB did not work anymore. But the problem was that the SIM card has to be registered and after I have done it , 1 and 1/2 day where passed it worked once again but the same problem I had in Taipei