Dopod S 1 SMS doesn't ring, but the incoming call is ringing! How to solve it?

In "Settings" and "Sounds and Alerts", you should link the incoming call with the new SMS to play the sound.

Another possibility is that you put the ringtone or SMS ringtone in the TF card. After you take out the card, the incoming call or new text message will automatically jump back to the original ringtone. You'd better keep the bell in your memory.