Is there anyone who uses the mobile service by "Power 3G" ? Bought a pre paid SIM at the airport and then topped up regularly ( Actually I thgouth it was '"3", good marketting trick I think, to have similar names) . The service was good initially but now on very cold or rainy days there is frequant breakages in signals. I will be in HK for 2 years and 10 months more... so need to decide whether to keep the same SIM or change it.. Thanks in advance.