Question: i created a web service, upload it to my site on a remote server.
i tried to browse it but i cant, i also tried to add web reference to his adress through vs08 but the same problem happened there.

Answer: 
It is not possible to modify the default screen of a device with J2ME. You need a native application (Symbian, Windows Mobile) to do so. J2ME lays in a sandboxed environment and has many restrictions on what you can access. An application can only be started by the user and can't run as a service. It is also not possible to register an application to run at the start-up of the phone. 

It has been discussed that MIDP 3.0 may address many of the above issues, but I don't think it will ever be available.
From an application lifecycle point of view, there are ways to approximate what you are trying to do but they almost unvariably require handset manufacturer support.

If you have a choice, the Sony Ericsson JP8 platform has non-standard extensions to JavaME that can help.

Accessing telephony information, however will be a major issue. Look for a handset that implements the cbs protocol of JSR-120, it could prove useful.

Accessing the phone idle/standby/main screen on Series60 (Symbian) phones will require nokia support too, BTW.