asp.net development WAP program must: Identify the phone brand model

We are developing WAP applications need to identify the mobile phone brand model features, so that we can better provide users with better personalized services, such as Picture type, screen size, ring type, and so on.
HTTP protocol, user-agent this header indicates the browser information, the article finally attaches a common mobile phone user-agent.
Each manufacturer, or even a manufacturer of multiple brands of User-agent has not a uniform naming standards, so the processing is quite troublesome---non-stop if.
Like judging the brand of a mobile phone
If Request.UserAgent.ToUpper.StartsWith ("MOT") Or Request.UserAgent.ToUpper.StartsWith ("MOT") Then
' Motorola
End If
If Me.Request.UserAgent.ToUpper.IndexOf ("-SGH") > 0 Then
' Samsung
End If
The method of judging the model is the same.
There are also some exceptions to this process, such as Motorola E360 will be identified as T33 this is the manufacturer's problem.
Common mobile phone User-agent:
Log_brand Log_module Log_ua
Arima Arima 2860 profile/midp-2.0 configuration/cldc-1.1
CECT A706 CECT A706
CECT E818 cect-e818/(2004.07.01) sw2.0.0/wap1.2 profile/midp-2.0
CECT G3300 CECT g3300/ut_sammy_a_06.20/wap1.2 profile/midp-2.0 configuration/cldc-1.1
CECT M62 Cect-m62
CECT M72 Cect-m72
CECT S568 cects568/(2004.07.27) sw2.0.0/wap1.2
CECT S857 CECT S857
CECT T586 cectt586/(2004.11.30) 1.0/wap1.2.1 profile
CECT T700 cect_t700
CECT T868 CECT T868
Compal C8600 compal-c8600/1.0 up. browser/6.2.2.3 (GUI) mmp/1.0
Compal CHASE898 compal-chase898/1.0 up. browser/6.2.2.3 (GUI) mmp/1.0