How to prevent the WAP connection in BlackBerry?

I found most of my friends and also me have a problem that almost everyday the operator take from them about 1.25 EGP for using the WAP instead of the BIS although they never use the WAP.

When trying to contact the operator , they say that programs like Whatsapp , Nimbuzz , etc ... using the WAP NOT the BIS but I found that these programs work fine on the BIS and when I told them that they told that there is a bug in these programs and I have to update them!!! They also told me to subscribe to a monthly Internet (WAP) !!!

Anyway I found the solution is to delete the service books that belong to the WAP.
*FOR BLACKBERRY OS 5:
1)Go to (OPTIONS)
2)Go to (ADVANCED SETTINGS)
3)Go to (SERVICE BOOK)
4)Delete (Wap Push Config) , (WAP2 Transport) & (WAP BrowserConfig)
5)That is it :)

*FOR BLACKBERRY OS 6 , 7 , 7.1:
1)Go to (OPTIONS)
2)Go to (DEVICE)
3)Go to (ADVANCED SYSTEM SETTINGS)
4)Go to (SERVICE BOOK)
5)Delete (Wap Push Config) , (WAP2 Transport) & (WAP BrowserConfig)
6)That is it :)

Note (1):
If you want back these service books restart your mobile or re-register your handheld from the (HOST ROUTING TABLE).

Note (2):
Almost everything need to connect to the internet will use the BIS fine EXCEPT STREAMING IT WILL USE THE WAP.