Solution
On some mobiles, WAP-Push is “deactivated” by default.

If WAP-Push is deactivated, you won’t be able to receive any download links. (This problem occurs more frequently with certain Samsung and Sony Ericsson mobile phones.) Here’s how you can easily activate WAP-Push on your mobile:

Samsung: From the main menu go to “Messages”, and then to WAP Push/Push permit. Please change the setting to “always”.
Sony Ericsson: From the main menu go to “Messages”, and then to WAP Push/Push permit. Please change the setting to “always”.
Siemens: The HTTP- and JAVA-profiles aren’t configured. In Siemens phones the HTTP and Java profile must be configured separately to the normal WAP settings. Please ask a Siemens representative for assistance.