Help! After doing a hard reset, I cant select the In My Heart.dcf as my ringtone! It says activation key not found! Help!

Hi bro, u go to Menu > Tools > Profiles > General > Option > Personalise and then select Video Call Tone and then select change..Change your own ringtone 

Cheers, 

i have a little tip on this:

many of us have a style of playing music affected by winamp which is selecting a folder and then play it. but when we come to mobile mp3 player or phone like n73, this is not possible anymore because songs in such devices are listed by playlist, album, artist or just simply all track. how if our songs doesn't have those ID3 information? problem came when you're trying to look for the tracks that you've just copied without any ID3 information or your actual mp3 storing on memory card is by your favourite folder structure and you might want to play a certain folder only like in our old day winamp player. 

what i suggest is to download id3 editor program like this: http://www.softsea.com/review/PZ-TagEditor.html

and set composer attribute of all mp3 files in a particular folder to your desire name and then run the n73 music player, go to composers and choose the name you put just now. i'm setting composer attribute instead of others like artist, album is because composer is less likely to be set in most mp3 files, normally this attribute is leaving empty.

I always use 3g Internet... no different I think