This morning i couldn't received call & call out with my handphone, except the SMS function was still working. I called singtel immediately, the technical support guy gave me instruction to change the phone setting from 4G(LTE) to 3G(GSM/WCDMA). He explained to me that the 4G was the caused of the problem & told me to stick with 3G in the future. So my question is that i pay for the 4G, but i must use 3G network to surf net? So this is Singtel solution to the problem? Does anyone of you have this issue, do you think that this is acceptable?