Nokia SERIES 30 Benutzerhandbuch

 

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The Nokia Series 30 UI is designed to be easy to use and intuitive. The following section offers general 

guidelines to help developers create browsing applications that will be perceived as usable and easy 

to understand. 

When deciding what information to include in various applications on a mobile terminal, developers 

should consider the types of situations where the mobile phone will be used. The content of the 

service should fulfill the needs of the target user group and be optimized for the most common tasks. 

Because of the mobility of the small display, the user might primarily use the mobile phone when 
there is no PC access to the Internet, and for quick information. Examples might include speedy access 

to flight schedules, short news flashes, and access to weather information or checking the 

temperature at a traveler’s destination. It is less likely that users will use their mobile phones to surf. 

There are several XML validators available that validate documents against WML Document Type 

Definition. It is recommended that authors validate their WAP pages, because invalid WML is always 

treated as an error and discarded (that is, it is not shown to the user). 

Several XML validators can be found at http://www.wapdevelopers.org/. 

GPRS enables efficient use of resources, instant access, fast delivery of information, and innovative 

charging models.  

2.3.1 

No changes required by developers  

Since the WAP standard was designed to allow content to be delivered over any bearer service, it is 
not necessary for developers to make changes to their WAP services or applications. This is true even 

when delivery of the services is enabled over GPRS, 3G, or any other networks. 

2.3.2 Cache 

utilization 

Developers should use HTTP proxy to cache WML content whenever the content is accessed through 

the Internet. The proxy should be placed close to the WAP gateway to minimize the distance for data 

transfer between the two components. The home page (first page) can alternatively be kept on a local 

server, close to the WAP gateway. 

Most clients have a cache; using it is a good way to improve the user's experience. Cache headers 
should be sent with documents to ensure that pages are cached on the client if possible.  Content 

developers should not assume that pages are cached by default. 

2.3.3 Usability 

tips 

Round trips in the network add a minimum two-second delay to the response time. Therefore the 

number of round trips should be minimized. The response time of a first page has a strong impact on 

the user experience, so it is worth optimizing.  

 

WAP Service Developer's Guide for Nokia Series 30 Phones with WML Browser

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