Free iPhone’s memory
When your iPhone suddenly quits applications and runs veeeery sloooowly the problem is in memory.
An easy way to get back memory occupied by other programs is use Free Memory. This application is really great. Open it and touch ‘Free Memory’ button. In a couple of seconds your device will gain more free memory to use. Now you do not need to restart it, just use Free Memory.
Thanks to it you can also view running processes and battery level.