of attachments in the UE side is therefore very important for efficient messag- ing applications, and controlling the balance between compression ratio and user satisfaction with the quality of the media received is a key factor to differentiate between friendly and unfriendly applications. Table 16.1 illustrates the performance of three messaging applications for the transmission of text and picture messages. Application 1 uses clearly more bandwidth and drains also more battery than other two applications. Application 2 takes 20-25% less battery power and uses nearly 10 times less bandwidth than application 1. 16.6 Streaming Applications Music streaming applications have become very popular in cellular devices, with increased number of users preferring to stream music from remote servers rather than saving it locally in the device. When it comes to how different streaming services interact with the cellular network and smartphones, there are measurable differences in how much signalling, load and battery are used by the application. Figure 16.20 summarizes the payload generated, battery consumption and radio signalling generated by three different applications during 1 hour of continuous music streaming. The payload reflects the different encoding of the music, where applications with higher quality music will consume more payload than others. Battery consumption on the other hand depends not only on the amount of data transferred, but also on how much processing power is required by the client application to decode and play the music. Finally, the radio signalling indicates how friendly the application is towards the network. Application 3 with significantly lower signalling load than others indicates that it downloads whole songs as a single transfer before playing, while other applications with more signalling download the songs in chunks, causing multiple activation/deactivation of the radio connection for each song. On the other hand, Application 3 uses more power and consumes also more bandwidth than the 