116 and the mobile network 112 communications between the user equipment 102 and the mobile network 112 and within the mobile network 112 are inherently secure due to the security requirements under the gsm standards the application server 120 is also operated by a third party which may or may not be the same as the operator of the sms gateway 116 and can provide applications and services to the user equipment for example the application server 120 can provide applications and services that can be downloaded by the user equipment 102 such as games music and video download services at least some of these applications require the user to download an application onto the user equipment 102 first and register that application before subsequent use of it the specific operation of the elements in fig1 in process for registering an application on the user equipment 102 will be described in more detail below with reference to the message flow diagram of fig2 references in fig2 to the elements found in fig1 are made using like reference numerals in step 200 the user equipment 102 already has an application stored in its memory 108 in this example the application is a music download application but could be any other application stored on the user equipment 102 the application can be provided in a number of different ways such as by downloading by the user or it can be preloaded on the device one method of.