It's only a choice between CSL and '3'. CSL have two offerings; 1010 and one2free with the former costing you more. However, neither offer an unlimited airtime (email usage) plan, '3' does and it is their costs that I posted earlier. I would hazard a guess at which company offers the best BB service as new this service is to HK. Granted CSL should be the best in terms of cell coverage and hence GPRS availability and strength. I'm a one2free user and have been for years and can confirm that I lose calls often and often fail to get a line. I have in the past been a user of Smartone and Orange and though for shorter periods had a satisfactory level of service. Who to choose?