The N73 runs on a Series60 operating software, which is a very advanced and multitasking software, that can run many applications and background and pop-up operations at the same time. So, this operating software require fast processor and high RAM (minimum requirements for good performance- 70 MB of RAM and 369 MHz processor). Unfortunately, the processor of N73 is too slow and the RAM is insufficient for multitasking. That's why, the processor and RAM is often overloaded and as a result it hangs. There's nothing you can do for this, but if you don't use too many programs at the same time, you might not face the problem. I recommend you to use a better task-manager like Handy Taskman and Jbak Taskman, which can show you the current status of your phone's RAM and allow you to manage active tasks. Handy Taskman can be downloaded from http://www.epocware.com
, but it is not a freeware. So, you can download Jbak Taskman (for Symbian 9.x) from http://jbak.ru/jbaktaskman_en.php
instead. Jbak Taskman is a freeware.