Like all smartphones, Galaxy S II can run multiple applications simultaneously and Thanks to the dual core processor and generous RAM, performance is exemplary. This is the first handset Android which we can say that compound sentenced without stuttering (and Nexus S falls into this category), but it is worth stressing that the system keeps operating smoothly in all conditions of loading. Samsung has included, as in previous editions, a manager of applications started, which displays detailed information about resources used by each program.Samsung has included with the default phone software can exchange files with a computer and access the WiFi network, thanks to a new application called Air Kies, no need for cable. The user only needs to enter the IP address of the phone (displayed on the display while the program is active) in the browser or computer and have immediate access to all photos, videos or documents stored in memory. Air Kies will not use the data channel from your mobile service provider. If you are looking for SIM card only deals you will find the best contracts that will suite you.