I am using SUNDAY but... totally disappointed.
First of all, coverage. Almost the worst, recently, i went to tuen mun hospital, the reception is very marginal and i search the network and see every competitor except itself,
Even travelling by the MTR airport express, being disconnected for a few times and at that time i was in a conversation with a customer, so humiliate.
Secondly, customer service, hotline staff are so unhelpful. Once i try to dispute again a call which having a duration of 3.5 hours. They just dont listen to my queries (my phone is not high end, how to talk for over 3 hours, impossible) and just insist the record is correct and i have to pay.
So, better change to another operator...