Qfi EF series
Qfi series is designed with the music lover in mind. These phones have very high sound quality and performance. The hand sets are sleek and stylish with flip open mechanism.
EF series
They are smart phones with HSDPA transfer technology in them. There are two models namely EF81 and EF91. EF91 has dual screens and clamshell handset. EF81 also has a clamshell handset, but they are ultra thin Mobile Phone.
EL series
EL 71 has slide opening for a change. They are also ultra thin mobiles.
BenQ-Siemens has S and SF series which all have ultra thin designs to their advantage. BenQ-Siemens hand phones are for those who want sleek stylish ultra thin mobiles in their pocket.
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