Thank you for your post
What handset are using? I would recommend the basic, ensuring your handset is up to date with the latest software.
Check your internal space, move your media (pictures, mp3 files, videos, and so forth) to the external memory, usually an SD card.
I would also recommend clearing the internet cache by accessing settings in the browser as well as clearing the RAM for the phone using the task manager
Also un-install any application which you do not use.
These will help speed up your phone
Hope this helps