何となくW-ZERO3のUSER_AGENTを調べてみた。

W-ZERO3(WS003SH)
Mozilla/4.0 (compatible; MSIE 4.01; Windows CE; SHARP/WS003SH; PPC; 480x640)

opera
Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; SHARP/WS003SH; PPC; 480x640) Opera 8.60 [ja]
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) Opera 8.60 [ja]

アドエス(WS011SH)
IE
Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 6.12) WS011SH

opera
Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; SHARP/WS011SH; PPC; 480x800) Opera 8.7 [ja]
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) Opera 8.7 [ja]

operaはUSER_AGENTの切り替えができるので、両方とも載せてます