Hi Jürgen,
Thanks for replying and sharing your experience - it is really helpful (imagine how this default logon screen might look like on an iPhone, for example 
)
The most interesting thing about this case is that we are using similar hardware (Motorola WAP4) and Wavelink Industrial Browser, however, logon screen was not an issue - it is displayed OK (see image below). What version of SAP Basis do you have?
