You shouldn't have to as MP3 on the same type of cards should be able to be played on any other phones. What does it actually say on the screen when you searched for it?
Being a Vodafone branded handset you may not be able to play non Vodafone DRM'd songs - ie songs downloaded from the VF music store.
selection of current and classic tracks. Only in a 3G area.
Your phone is also a portable music player. You can
download music from Vodafone live! or transfer it to the
memory card.Go to Menu > Music > Music store to download and
own more music.
To create a new playlist, press or Menu > Music
•Open a playlist, then press Options > Add, and add the
tracks you want.
Choose your playlist and press Options > Play.